I agree with the above but a few more points :). First, your irons look a little long..your knee angle is a little straighter than it should be, however, this could be caused by the next point :)
You are standing in your irons which is common and at that height I can understand :). You need to drop yourself back and down, pushing your weight nto your heel to help your position.
Think of it this way. When the horse starts the jump, push him away with your hands. This will help keep you over the center of the saddle and allow you to fold at the hip rather than stand up and do what I refer to as "looming" over the horse. You'll find your balance is much better. Since this helps with your balance, you will find your leg is less likely to slip back and you will maintain a better calf position so your toes aren't turning outward.
Do some two-point exercises in your warm-up concentrating on pushing weight into your heels and keeping your calf on the horse and your toes pointing up and only slightly out. Muscle memory is real and the more you practice it the easier it is to take the same form over jumps.
At another quick glance, it looks like you are using an open release. Was this deliberate? It is a good release, nice straight line from the elbow to the mouth even if it was a mistake :)
Congratulations on the new height...it seems to be a break point after 3'6.
Last edited by tlkng1; 12-29-2011 at 04:38 PM.