i was going to say the same thing as the above poster! If so I would not recommend jumping in one (in fact i dont even really like them at all)
as far as your o/f position you are a bit ahead in the second and 3rd jumping pics (didnt watch the video) and your leg looks a hair loose. I agree w. you that your stirrups are a bit long.
otherwise your o/f position looks pretty good, you could lower your hands a bit in the second jumping picture but otherwise your release is appropriate.
good to hear your horse is coming back after an injury, that is always a drag when they are hurt, what did he have wrong?