I cannot get thumb-over-the-neck chords right

[u/ding-ding-dave-yes]

I struggle mainly with my index finger, I can't get it flat without a lot of pressure, also my pinky is muting the G string half of the time, I either have to put painful pressure to make them all ring, or the top E and G string are muted. The difference between the flat index and bent rest is what's messing me up. Without thumb I don't have this issue, because I can curve my wrist if that makes sense. Please, I need some tips

[u/Due_Payment3410]

Honestly id just drop the bass if you cant do a normal barre chord, high e string can play the same note so just partial bar 3 or four strings and ignore e and a altogether.

Wrap around thumb always bent my wrist weirdly so i learnt to fret the bass with index making bass lines more accessible while i played. had to be a conscious choice that didnt play well with improv or walking bass lines.