The only things I really noticed was that when you were cantering your feet went straight out to the side when they should be pointing more to the front. This may be because you are putting to much weight into your stirrups and not holding on with your legs as much as you should be. My other point is that I saw you were sticking your legs/feet forward (chair seat) when you went through one of the jump/pole combo's. Put your legs/feet a bit further back, heels down, and sit deeper into the saddle. Others's have also been saying to round your horse up a bit more, I agree. My first coach was a dressage coach and my first jumping coach was an eventer so she did dressage as well, my current coach is a dressage/jumper coach as well so I am always working on collecting/rounding/bending my horse (flatwork). From what I have seen/learned is that basic dressage is in everything we do when jumping. I am not telling you to do dressage movements/full collection but just round your horse up and he will work a lot better from his bum and have a more powerful but controlable take off/jump/landing. Good job on the last part of the video. I almost fell off my pony like that at a show, though this looked a lot harder to stay on!