Wow, look's really great ...

And that boots are not so bad ... it's for sure the outdoor work(wo)man's version with buildin steel caps ... but there have been hangar's and heavy tool's and vehicles so it's saving the cute toe's ... ok, ok, V4's toe's are not so cute as they could be but need's safety too ...

Only seen problem is not your's ... comparing to other figures V4's feet seem's to be to long ...  making especialy round shoe looking a bit oversized ...

Your problem with the flying off belt buckle might be the origin. If the part's of 1figure have different origins sometimes if scaling all together they drift apart. I get this effect also sometimes in C4D.

The problem with the fabrics on the arm's is the u-v orientation. Look's like a bug not a general feature cause the legs are correct. If both arm's had different material zone it would be no problem. Switching U and V component would solve it on the right arm. But as I remember both arm's share one mat zone. Only quick solution for V4 creating a new mat zone for the right arm.