It's hard to tell from the angle and distance, but I suspect (at least on the pony) you're jumping ahead and pinching with your knee. Your center should not be in front of the pommel (looks like it's half way up the neck). The other thing I see is your release. Even though it's generous, it floats above the neck. Given your sliding base support, I would want to see you pressing into the horse's neck, incase you get caught behind/off balance.
However, you've got a good flat back, eyes up and toes up. And from what I can see, you look much more comfortable on the OTTB. I used to love Ludwigs.
If your horse says no, you either asked the wrong question or asked the question wrong
And God took a handful of southerly wind, blew His breath over it and created the horse