[Yannos]

for the belt, most people would say to you that its at the hip.
For the hight, it all depends on your personal choice, try some different config.
Bunching up is pretty normal i think because trouser are loose and the holstler need to be tight.

like i said, try different config and you'll find what you are the most confortable in

hope that help!

Oh and Welcome to ASC!