Are you jumping him in a round pen? If so, I don't recommend it. He cannot get at a good straight shot at the jump and he does not have enough room. He seems to be hitting the jumps at an angle, which is not letting him get into a good form.
Things that I would recommned is having a bigger area where he can come to it straight, put a ground pole infront of the jump to let him have a take off spot and I would put some protective boot protection on him.

If you don't want to stand behind our soldiers who are in danger zones, please stand in front of one.
VanHalen 25 yr QH Stallion R.I.P. 4/11/82 - 5/8/08
Scout 19 yr Paint Cross Gelding
Dandy 13 yr QH Gelding