Can't really tell too much about conformation during a pole bending video. We'd need standing-still photos from each side, front, and back.
Your stirrups are too short. Lengthen them a hole.
Use your body to cue him through the poles. You are pulling on his mouth with your hands, like your other barrel video. Your hands should only be there as a guide.
Shorten your reins. They are too long.
Has he ever had his teeth checked? He shakes his head quite a bit throughout the run. It could be that he's frustrated at your hands pulling on him, but he could also have pain there too.
I'm posting this video so you can watch the rider's hands. While she does hold her hands higher than most people, look at how little
they move. And watch what she is doing with her body. Yes, this is a fantastic pole run and not everyone is going to look like that. But this should give you an idea to keep your hands quieter, and keep your body more stable.
I think you've got a nice horse on your hands there. We just have to make some tweaks to your riding.