Now, I tried the setnpcweight fix, and it seems to actually solve the problem, HOWEVER if I fast travel, the game resets the facetint back to the wrong setting. I'm not sure what else to try at this point, as I've done everything I can think of with the CK such as exporting the facegendata from my custom ESP (in my limited knowledge) and tried various mods to see if some sort of neckseam fixer would solve the issue. No luck.
I was thinking maybe it was a load order issue, but even with all of my other mods turned off like coverwomen, the issue still exists.
Has anyone else run across this or have any idea what the issue might be and/or how to fix it?
Thanks in advance.
EDIT: further investigation shows that its an issue only with NPCs that are vampirerace (Ysolda had no issue, turned her into a vampire and bam-same problem). I have no idea how to fix it though. any advice is appreciated.