You look to be a very solid rider, with a strong seat and leg. At times you look to be quite tense in your shoulders. Which is likely caused by the fact that your head and neck tends to jut forward, well ahead of your spine. Look at this drawing:
For the horse, the learning happens on the release of the aid. That means if you don't release the aid, the horse will not learn.
"Don't take the tempo down without revving the engine." ~ Chris Bartle
I don't even think about aiming a young or green horse at a jump until I have them 100% in front of my leg on the flat. If you do, and the horse thinks about stopping, you will have no recourse, and will end up teaching him that
From Facebook fan Joan Dunlap ~ "Fix your position first... then the horse will adjust theirs."