You look great in this picture.
Your leg is exactly where it should be, your heels are being permitted to do their job, and your hip angle IS EXACTLY where it should be. You ALWAYS allow your horse to close the angle for you, you never do that for your horse. ALLOW your horse to do his job - and here, that is exactly what you are doing.
Your seat is exactly where it should be, you've allowed your horse to lift you out of your tack, instead of you thrusting yourself forward. Your seat has a great space from your saddle, and your seat is dead center over your saddle. Not too far back, not too far forward.
Your release needs work though.
Your back, you've allowed it to hollow, you need to straigten it. Your shoulders are nice and I love that you are looking up.
This picture here - you've really jumped ahead. See how much space is between your saddle and your seat? You've lurched ahead - and the reason being, is that you've anticipated the fence.
You do NOT stop jumping ahead by closing your hip angle - you stop jumping ahead by riding your horse, not the fence.
Your legs are good here. They are at the girth, exactly where you want them. Your heels are being permitted to do their job - what you've done here, is ridden the fence. You anticipated it - you rode the fence, not your horse. So, by not allowing your horse to do his job - you tried to do it for him.
You need to focus on your horses rhythm, you need to focus on where you are on your horse - focus on the more important factor in this equation..which is your horse.
Stop focusing on the fence - you know it is there, your horse knows it is there - so why stare at it? Why pay any attention to it? No need to. Trust your horse, allow him to do his job. Sit, wait, ride his rhythm - not the fence.
You don't need to do stirrupless work - your legs are solid as it is. Stirrupless work is meant for riders who have lack of security in their lower leg - you have this. You need to work on focusing on what is under you, not infront of you.
I highly recommend you look at the thread started by myself, titled Jumping Form - there is a picture of a rider in there that one does not want to become.
Remember - your horse closes the angle. Your horse lifts you out of your tack. Your horse is the one who gets you over the fence - your job, is to get your horse to the base of the fence in a rhythmic, strait, fluid movement.
Allow your horse to do his job.