Doubts about vertex paint weights and uv_1 in my cc

makes sense, since this is something one does not do normally

Hi, I'm here again, I took a break on this hair cause I was getting burned out from it. So basically I ended up doing this (merging the reference by distance before data transfer) back then, and it had seemed to work, I thought i'd fixed the issue, the mesh wasn't torn in cas and it just had ever so slight distortion which i'd thought was only from me not fixing the weights.
Well i've finished all my hat chops to the best of my ability and then fixed the weights, but there is still a very slight distortion on the hair in game, so not broken but the strands are a bit bent around the face and front of the hair. I don't know if the hair is still torn, if a another reference would have been better (unfortunately I can't remember which one I used but I'll try others if this could be the problem), if the weights aren't fixed properly or what the problem is now. I know it is so small but I'd like it to look the same as in blender
Adding the package and pic

Thank you. I tried this, deleted all vertex groups, mesh weights normalise all with lock active disabled and then added the new color0 with 007F02 deleting old one
Then tried importing it to s4s and got a very strange error, tried reopening s4s and saving the blend as another file and it still is the same
I'm sorry I don't understand the error 😥
Edit: it is happening regardless of which mesh I import... I'll try a restart to see if it's just a glitch
Ok so restarted and an even longer similar error window has appeared

Unfortunately I'm getting the same error. I uninstalled and reinstalled twice, tried changing the blender path to another version of blender (then it just wouldn't import or export at all, with infinite loading)
Tried exporting the LOD and redoing it and importing again, same problem, tried importing another Lod from before that used to let me and same :(
Have tried importing old lod on old package and infinite importing 
Have tried creating new package and it won't let me export ea mesh.

Hi mauvemorn,
The error doesn't say much except that the script failed to get the vertex color. It also has a lot of warnings that don't seem directly related to s4s.

moonbiscuitsims can you send the current package and blend file you are importing when you get that error? Also, have you tried with a different version of Blender like 4.1?

Hi, update on this, i've uninstalled and reinstalled again, and tried another package first and I'm not longer getting infinite importing or exporting or the error appearing, it only now appears with my package, so I don't know before what happened for it to affect everything, but now it is clear it is only my bad package, which means that I did something wrong, so I'm attaching a video showing what I do when I attempt:

"In maxis meshes the hairline and sometimes hair that is very close to the face are affected by morph bones (have CAS in their name ) and are vertex painted with a special color. so what you can do is delete all vertex groups beside head and neck, then select everything and Mesh - Weights - Normalize all with Lock active disabled. After that delete an existing color attribute and create a new one with 007F02"
It still has the error when importing this package.

Hope it helps, I don't know if maybe this step was meant to be done at another moment of the process or if im not understanding it right.