I think you ride very well. One of the better Western riders I have seen post on this forum. Your horse is a very nice mover and has a correct lope and good jog. Don't mess it up by slowing her too much .
She's a doll!
You just need those stirrups down. Your posting was actually not bad. You moved in rythm with the horse, which has a slightly choppy rapid stride at trotting out, and that's what is important. I didn't see you bopping the saddle at all, in fact the horse looked pretty happy and comfortable with you on her. You seem to have a very trusting relationahip.
The ONLY thing you really need to work on, already mentioned, was the overtwisting of the upper body. You ride so quietly overall (a little too noticeaqble spur work , keep it lower and try for ankle movement only) so you need to quiet the upper body in that lateral work.
I could not ride half as nicely as you do, and that's the plain truth.