Bravo on your position in that second jump. If you pause it at 11 seconds, you're almost perfect. If I had to dissect it, and I will because I'm stuck here at work for another 10 hours while all my friends are out riding, I'd say leg is actually a hair forward, you butt is perfect and just enough out of the saddle to free up your horse's back. Your back is a nano-tad slouched not even to point of mentioning. Release is adequate but you're hands are floating over his neck. If you're going to use a crest release, I believe your hands should be in contact with his neck.
The 3'0" pic is a little less pretty. At 14 seconds, you're jumping ahead a little, pinching with your knee and lower leg is coming back a little as a result of the knee. Looks like your horse has a strong jump which I'm sure comes into play.
I think you might be able to improve his jarring jump with some dressage training. While your position is secure, he's a little flat and strung out when he's cantering to the fence. Dressage would go a long way toward him being able to balance himself better, his canter would be more round and bouncy and his overall jump would just feel better.
That's all I've got. Only 9 hours, 56 minutes to go...
You just have to see your distance...you don't have to like it.