hair weight issues among other things

Hi! So I've been making some "frankenmesh" hairs using EA meshes lately just to figure out what's what and how to create hairs. For this particular hair, i've been having trouble with the weights (i think). aka the hair mesh starts clipping into the head when i use poses and  when the head is at max size (pictures). I also would like to play around with the uv and texture some more, but i've already done the hat chops. if I change the uv map's position on the main chop, is there an easy way to also apply those changes to the hat chops I already made or do I just have to redo them? Thanks!!

files

before you download disclaimer: the only swatch i've applied the correct texture on is the yellowy blonde one, so that's the one i'd suggest viewing lol. ALSO all of the maps (esp the shadow map) are from the previous mesh so just disregard those since they look wonky with this hair.

blender file
.package file