The texture seam seems to be a VAM bug where different skins can sometimes "stretch" textures for no reason. Resetting them and re-saving seems to work, it's beyond science tbh
@myt Please try the new version and see if it's better!
New morph from scratch
Rewrapped textures (gen textures should be better now)
New assetbundle with lots of variants of hairs
Fingers are correctly sized now
Tick "show hidden" if it's hidden and select the CUA to change the hairs.