Westphalian?????/ WOW! Jealous. .. Love them! So anyway! You look like a great match... The few things that I noticed.
-Coming out of the saddle too much... It looks like your're floating above the saddle instead of just hovering, with your fanny just an inch or two. When you come out too much it's usually because you're almost standing on your knees? I'm not sure if that's what you're doing, but I just thought I'd mention it.
-Also, just as a realy picky critique because your horse is an excellent jumper and there's barely anything else... Your horses legs.. In the first video if you watch the last jumps in slow motion you'll see that your horse will bring is legs up, and then right before the jump, take another step with his hind.. I think if you get a slower, more relaxed approach ,and then make your signals clear, and think "UP!" you'll get a quicker response, and your horse will take off exactly where it's "right". Hope this help!