Thanks for your changes, looks much better now. Still, there are some issues left, mostly stylistic ones. Also, I recommend you to read the TR dialogue style guide: https://wiki.project-tamriel.com/wiki/Writing_and_Dialogue_Guidelines (sorry, forgot to mention it the first time).

Greetings:

• You've put your Greeting 1 entries in the middle of Hlan Oek dialogue, which might be confusing for other people who will modify them in the future. Recreate them at the very top, leaving only the Oath of Silence entry above them.
• The second Greeting 1 entry from the bottom has a "11111 test journal" filter
• One of Greeting 5 entries has "aren’t", which features the problem of copy-pasting dialogue from other editors. Change it to "aren't" with a different apostrophe

Rumors:

• Your rumors should be filtered to 30 disposition
• You've placed your rumors above the ones filtered to particular classes or cells. To avoid overlapping them, place your entries below the ones with class/cell filters and adjust your Random100 values (I recommend to set it to 90)
• Your rumors should account for Khajiit NPCs who don't speak in first person. Either rephrase your line to avoid first-person speech, or add an alternative version also filtered to "Local" "T_Local_Khajiit" = 1
• Your rumors should also have a Melur Beloth dead filter. There'll be no space left for a slave dead filter, so I'd suggest to remove it entirely from rumors and Manse's dialogue, because the quest is possible to complete with him dead already.
• "Manse Menas has ben holed up" -> "has been"
• "I wonder how she manages to continue doing her deliveries without leaving the place?" shouldn't be a question. Replace the question mark with a period.
• buisness -> business
• Racker’s -> Racker's (different apostrophe again)

Journal:

• Entry 100: "He was furious that I opened his letter and killed Abeek-Jah." can be interpreted as " He was furious that I killed Abeek-Jah.", just like the one I reported before. Same with 110. Please rephrase them.
• Entry 130: "Abeek-Jaj" -> "Abeek-Jah"

"letter to the overseer" topic, Manse's dialogue:

• "Stop wasting my time" entry shouldn't have a disposition filter. With low disposition, after she gives you the letter, she shouldn't say she doesn't trust you enough to talk about that.
• "Excellent, the name of the overseer is Melur Beloth" -- make it two sentences for better flow. "Excellent. The name of the overseer is Melur Beloth"

"letter to the overseer" topic, Melur's dialogue:

• "if ( player->getitemcount TR_m7_oth_q_edalvelletter == 1  )" has a double space before a closing bracket, leave only one
• Change "== 1" there to "> 0". If the player added one more letter to their inventory via console commands, the quest shouldn't break.
• Melur's dialogue shouldn't have a 30 disposition filter. You're just a courier here, I think he would prioritize his job over his trust to you.
•  [He reads the letter] should have a period at the end:  [He reads the letter.]
• Remove "removeitem gold_001 100" and leave only additem to avoid the problem with pickpocketing I mentioned before.
• "Prepare to die" entry (and in general, all entries with startcombat) should have a Goodbye.
• Currently, Melur will give you infinite amount of gold if you ask him about the letter after he kills the slave.

"letter to the overseer" topic, Abeek-Jah's dialogue:

• Abeek-Jah's entries shouldn't have a disposition filter. Why would he refuse a letter if he doesn't trust you? Especially if it may lead him to freedom.
• Choices should have periods. "[Show him the letter]" 1 "[Do nothing]" 2 -> "[Show him the letter.]" 1 "[Do nothing.]" 2
• The dialogue doesn't check if you have the letter in your possession.
• "Go with peace" -> "Go in peace"

Many TR NPC scripts follow the naming convention "TR_m<X>_NPC_<Name>". Your script names should also include surnames to avoid potential confusion between several npcs with the same name. Please rename TR_m7_oth_q_ManseSC to TR_m7_NPC_Manse_Menas, TR_m7_oth_q_melurSC to TR_m7_NPC_Melur_Beloth, and Tr_m7_oth_q_abeekSC to TR_m7_NPC_Abeek-Jah.

TR_m7_oth_q_ManseSC script:

• =< and => operators are incorrect, they should be <= and >= respectively.
• "additem letter" should happen if your journal stage is < 10, not <= 10
• "disable tr_m7_manse menas" is incorrect, it's either "tr_m7_manse menas"->disable (if called from elsewhere) or just "disable" (if called from a local script)

TR_m7_oth_q_melurSC script:

• Wrap the GetAIPackageDone condition into a GetCurrentAIPackage == 1 check. You shouldn't check that if his AI package is not AITravel.
• There's no need to use both control and controlQ in different conditions. Using only one of them should be enough and will let you avoid duplicate checks everywhere. Use journal and global TR_m7_Oth_q_eldavelletter_seal checks where you want them to do different things.
• Instead of "tr_m7_q_melur_beloth->aiwander 0 5 0 52 20 10 10" in his own script, you can write "aiwander 0 5 0 52 20 10 10"
• GetDeadCount is heavy for performance, use "tr_m7_q_abeek-jah"->OnDeath instead
• Use PositionCell instead of Position, it's more reliable since Position can sometimes lead to NPCs disappearing

TR_m7_q_Melur_Beloth NPC:

• Raise his Medium Armor a bit, he should be more proficient at that if he's wearing it
• Add some clothes to him. NPCs shouldn't wear only armor without any clothes beneath.

Good work, the latest update has huge improvements and better dialogue. With the hardest part already done, only one or two iterations remain, I guess.

• The sealed letter should use a paper roll model. For example, check another sealed letter, TR_m7_HH_SvoshLetter.
• Muck Racker's Hangout -> Muck Raker's Hangout, that's how it's actually called
• Your rumors are still in the wrong place. To understand how it works, look at all Othmura rumors from bottom to top. Rumors filtered to all town's cells and any class have increasing Random100 values, responsible for the chances of them appearing. Rumors above them filtered to particular places or NPC classes overlap everything below. You should place your new entries above those of the existing rumors filtered to everyone in town.
• "Why aren't you delivering my letter?" greeting shouldn't have a 30 disposition filter, same as the entry in the topic which you've already edited. Besides, it should be filtered to both QuestID >= 10 and QuestID < 100 (so as not to appear before the quest) and shouldn't have a Melur dead filter.
• "Stop wasting my time and deliever the letter" -> deliver
• Not an issue or anything, just a recommendation: when all of your dialogue choices are filtered to the same conditions, you can avoid adding all the filters there. "Function Choice = X" filter alone is enough for it to work.
• Actions in dialogue should be in square brackets: [Show him the letter.] and [Do nothing.] . This doesn't apply to the responses spoken by the character, such as Yes/No.
• Swap the choices in Abeek-Jah's and Melur's dialogue so "Yes" option is above. That's more in line with how vanilla quests do it.
• Make Abeek-Jah mention the letter in "Is there something I can do?" entry. If you don't have it, you don't really understand what to do there.
• When you warn Abeek-Jah, I think the game should treat it as a freed slave (remember that 15 freed slaves unlock the Twin Lamps). Check how vanilla dialogue changes their disposition and FreedSlavesCounter variable in "go free" topic, and do it here the similar way. Don't change slaveStatus though, because the slave is not actually freed at that moment.
• Since Abeek-Jah is planning an escape, you shouldn't be able to unlock his bracers. Add a custom line for him at the top of the "go free" topic, in which he refuses your help.
• Also, add a key called "Edalvel Plantation Slave Key" to Melur's inventory. It's logical that he should have it, even if it's not used anywhere.
• In Manse's and Abeek-Jah's scripts, add a return if TR_Map == 7 because it's better for performance than to set it at every frame. You did it right in Melur's script.
• You can break the quest by stealthily killing the slave or killing him before the quest, then delivering the letter to Melur. He'll still try to attack Abeek-Jah and will pay you 100 gold. In order to fix that, you can remove OnMurder check and instead set "TR_m7_q_Melur_Beloth".controlQ to -1 in case when "TR_m7_q_Melur_Beloth".controlQ != 3 for alternative dialogue.
• Melur's entries filtered to controlQ == 4 should be greetings you receive via forcegreeting. Since they update journal and end the quest, it's not obvious enough that you should talk to Melur again and click on the topic to progress in the quest further. The dialogue might need small changes to account for that.

Nice work. It's very close to completion, but still has some issues. Fix these and you'll be recommended for promotion.

1. The player shouldn't know that Abeek-Jah is involved in the quest before reading the letter. Make the journal update on his death appear only after you unseal it.
2. Journal entry 150 has "Quest Name" flag checked instead of "Finished"
3. Manse's dialogue entry in "letter to the overseer" shouldn't appear when Melur is dead.
4. If you want the letter to appear on Manse's corpse, the player should be able to show it to Abeek-Jah even before starting the quest. Or, a much simpler solution and the one I'd personally prefer, just don't add the letter to Manse's inventory on her death.
5. Use "SetHello 0" together with AiTravel. Melur shouldn't say his voiced greetings and abruptly stop for a few seconds while running to the slave. When AiTravel is done, set Hello back to 30.
6. Melur's dialogue lacks an entry filtered to journal == 50, seal == 0. That results in a dialogue loop if you unseal and re-seal the letter without warning the slave, then give it to Melur.
7. PositionCell should always be followed by AiWander. When you move an npc to a different location, his AI package still functions based on his old position. In order to fix that, you should run AiWander afterwards to reset his AI package.