He is still heavy on his forehand which means he is still unbalanced. It's easy to fly over a small jump, doesn't really take much effort. The higher jumps take more effort, so he needs to slow himself down and collect up a bit so that he can keep his balance and make it safely over the fence.
I know you didn't want critique but you didn't say no advice. I'm sorry if you arent looking for any. What I would do at this point is only trot the fences, he's athletic enough that he doesnt need to canter them. I would also halt a few strides after the jump and make him stand for a moment before continuing on. I would do that after EVERY jump. He'll be anticipating the stop and he will begin to slow himself down. You are still relying too much on your hands for control, but I can tell you have been working on it so... keep it up and good luck.....
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