This goes for you vids in the other thread as well:
I see a nice pony going around the ring with a passenger. The pace isn't even, the jumps are not consistent, the leads and changes are left up to the horse and you aren't really doing too much to fix those things.
I would have you doing a lot more no stirrup work to MAKE you sit in the saddle and ride to the fences. You are perching to them and jumping ahead of the horse - leading to a chip and an unbalanced landing. Through the corners your pony is really quickening the stride to try and get her feet under her that she doesn't fall down. Especially when riding horses who are a bit on the small side - we always have to be conscious of our balance! Don't lean into the corners.
Finally - leads. Know them, ride them and make the changes accurate. Half the time I can't tell what lead the horse is on and when she is swapping for you - her haunches are at least a stride late.
Dressage lessons would really improve your eq. Remember eq is not just about looking pretty - it is also about how we influence the horse!!
Good luck! You are very lucky to have such a nice hrose to learn on - take advantage of it!!