Arthur,
I just rotate my backquiver under my arm when I go through brush and don't have a problem. The bad thing about backquivers is they can be hot during early season. If stand hunting I just take it off and hang it on a hook within reach so all the other issues aren't a problem. With stalking I haven't found it to be too big a problem. The thing about the Plains style quiver is it bounces against your bumm, or the back of your leg if you don't get the length right. It can also ride around on you and then dump your arrows. I don't think there's a perfect quiver out there. It's just finding the one you prefer.