Since you were so helpfull with me on dressage issues, I hope I ll help you a little bit with jumping.
First question I have, is that YOU on the photos? Are you a mum ??? O_O wow! I wish I have your body when I ll become a mum, you look like a little girl! And now, on jumping again...
I v marked some things on your photos, coz I know that when you can't have time on saddle, it's good at least to think the theory of it.
So, in my opinion, in photo 1. I v marked the line of your horse's back, with red colour, and again, the line of your back, as it should be, again with red. The yellow line colour (the line you actually are using) is giving you an ankle of almost 40 degrees. I think this is how much you should put your line back. This forward type of line is used on higher jumps, when you need to lean to front, to follow the jump of the horse.
In second photo, I got in red circles your shoulders and your horses. Your horse's is going up, yours looks like pulling down. And also, you don't need to give him all that rein. Keeping your hands back and shorter reins will give both of you better balance.
All I want to come up to, is that at this high of jumps, you support better your horse is you don't lean to front. The less you move all your body, the less you move your weight center over her.
I hope my comments be helpfull to you, and by no means are negative :)
Horses have a great sense of humor...