While making another head variant for female CQ, I noticed that there is some movement of the mouth during the blinking animation on tr_b_chi_f_head_01.nif (and therefore, on my tr_b_chi_f_head_02.nif as well). It is fairly subtle but shouldn't be happening given that it does not occur on vanilla heads. I would have fixed it myself, but my knowledge of shapekey animations is currently limited.