FIX: Alr, for whoever is watching this in the future, the animations (.anim) files themselves were broken during the ripping process, found out when previewing them in the editor, replaced these anims with news ones that were in the original base model and worked like a charm
use vrchat > particle > multiply
vrchat recently made it so we can see transparent things if you use the vrchat particle shader. I know this because I am quest and I quest convert avatars VERY often. Also that eyebrow dissapearing is because backface culling, as of I know only can be fixed in blender by solidifying the mesh. (please tell me if theres another way to fix backface culling for quest)
@cuddlykyle It isn't you falling through the floor. It seems like that there is a collider on the avatar which you collide with all the time. That causes you to move to fast to use your menus or anything. Just go through the Avatar looking for colliders and you should be able to find the problem.
To prevent this in the future and keep the outline values at their defaults, Aswell as making sure you dont have to resize any physbone radius values the same way, select "FBX All" When you export your avatar from blender fbxall.png
