Same thing I usually tell you- let him move! Get momentum up to the fence, otherwise his timing is messy. Also, in all of the jumps (cept the last one, I noticed, where he took a long spot) his knees are way uneven. Maybe time to do some grids? With shows coming up, you're going to need to practice lower jumps anyway. :)
I don't know why I'm bothering to type this since I'll see you in a bit, but whatever.
As far as your position goes, I think you might've pinched your knee a bit, cos your lower leg was swinging a little and that would definitely explain why he wasn't moving out. You looked like you were up on his shoulder on one of the jumps, and a little up his neck on another, so watch out for that...
Really the thing I noticed was you looked like you were resorting back to standing up in the stirrups- like when he jumped it took you by surprise, so you just two pointed without 'feeling' the jump. Pah, cheap words from someone who doesn't jump. But that's what I see, from what I know about you & Sonny. Luck! :)