I don't have any direct critiques of your horse, but I would like to see you with QUIET hands (with your hands flopping all over the place you are giving lots of mixed signals and yanking on his mouth), and really stepping into your outside leg through your corners and circles, so you aren't leaning to the inside. That will help him balance, the quiet hands will help him soften and become more responsive. When you approach a few of the jumps you get tense and hunch over in your saddle, relax and try not to get ahead of the motion, perhaps try staying a bit lighter in the saddle rather than sitting down too hard on his back. Get your outside leg on after the jump (especially the verticals) to keep him from bulging out, and get a smoother corner.
I know you were mostly looking for feedback on your horse, but everything you do as a rider has a direct effect on your mount.