In the first video if you pause at 0:14 it looks like your jumping ahead and jumping UP rather than keeping your shoulders back and more or less folding your body over. With your release just think about gluing your arms to your horses neck and following his/her mouth rather than throwing your hands at him/her. With your leg just think about pushing your heels down and working on getting your leg to the girth. It doesn't look to bad at 0:14 but as you go over the jump it looks like you get thrown behind a bit.
In the second video at 0:11 I would say all the same things. Though in this video you look like your right with the motion of the jump! Just work on your leg and release
Love your horse, he/she is gorgeous! Good luck at the show!