In the first video it looks like your toes are pointed out. You need to get your toes in and your heels down.
You seem to have some issues finding distances, you chip a lot before the jump, and his front end lands to the right of where he takes off and where his hind end does.
Also, I couldn't tell, it looked like he was crossfiring sometimes, but I think one time you simplechanged it to fix it which was good.
Of course, I have no idea what I am talking about. I am very inexperienced at critiquing, but I am trying haha. He's a gorgeous horse, I love giant greys. Good luck at the series final!!!
There is something about the outside of a horse that is good for the inside of a man. ~Winston Churchill