[AUTO SOLVED] Mesh deforming weirdly

Hello, I'm in need of some help to fix a personal mod

Made a whole new mesh, for some reason it 'explodes' in cas. I've tried to fix it with a lot of methods, those included:

- make new package
- clone mesh
- redo weight paint
- clean weight vertex then limit total
- changed base mesh
- merged parts

none so far worked so I'm at a bit of a loss what im missing here. I've done it much like i've always done any other mods. 


This is how it looks in S4S ( ignore head and legs im not doing the Exclude part yet )



how it looks ingame:



here are the files: ( the base used, separated parts, merged parts and package )


drive.google.com/file/d/1sS3lCBQ_fb4UyWNsLw2SS8mynVkjtDN5/view?usp=share_link

drive.google.com/file/d/1EQRTzlmpNV7oQI-jWMerGJfilt8w8J3n/view?usp=share_link

drive.google.com/file/d/1UKBHEzjZ6koY1baN3XkWkgB9Q_lpy9fe/view?usp=share_link

drive.google.com/file/d/1zFyngMZy1OUAjHr1Ahok_EoSxY2R8scO/view?usp=share_link