nice looking horses:)
Over the jumps, your lower leg is going back too much. It needs to stay under you. Now, for your upper body, try releasing with ur hands/arms a little bit more. Also, you are coming out of the saddle quite a bit, but that is probably just because of your lower leg.
So, fix your lower leg, and everything will come into place!!
I had the exact same problem before..man...did I ever hate it! Lol With the help of my coach, we fixed it:)
Good luck, and don't give up, you look great:)