I never RUN patterns I was using that as an example that he will if asked, I never go more than a fast lope in the arena im riding in right now. And in my arena iv never done a whole reining pattern. I make my own exercise to do with him and I only work on so much in a day. I understand what your saying but he does tuck his butt down and I ride him pretty good each day, so I would hope his hind end is strong enough, but maybe not. After I stop him though I back him up one or two steps then stand, is that to much?
I don't think he is driving under himself well but it really feels like he wants to then he second guess's himself and hops, ill try what you suggested tomorrow and see what he does. :]