[SOLVED] Loose vertices floating around pelvis

Hi All! This forum has helped me immensly throughout the creation proces, but it seems I'm stuck now, so I'm reaching out to you.

The problem is loose vertices in the pelvis area and they change the angle when rotating the camera. Not sure what's causing this, I'm betting either uv_1 (I tried different refs for DataTransfer but it still comes out pretty jagged and it's always the same vertices floating regardles of ref) or weights (nothing too obvious for me after inspecting all the groups). Perhaps it's somethign else I' not aware of. I'm using split edges but I've assigned weights first and only then split edges.

Here are my files: .package, .blend (3.6) [edit: updated blend link]

Mesh is partially ea, partially mine and I used mirror a lot.

Any idea would be a huge help, thanks in advance