>>316195260
the armature proportions shouldn't be an issue if the viewball is set up correctly. Certainly if you're standing (your headset is above the floor at the height you put in the vrchat settings, and your playspace floor is calibrated correctly), then vrchat should scale the world so your avatar is also standing. However, there's also some sort of scaling that vrchat does to try to make it so your outstretched arms irl correspond to your avatar's armspan in T-pose; it does this with some multiplier to your height setting, but I don't know the exact formula.

>>316195765
I don't think so, the head bone rotation is taken from your headset but the Z axis translation is separate I think. I personally prefer sticking the viewball deep in the head anyway for body immersion, especially now that they fixed whatever caused your viewball to sink into your neck while lying down in FBT.