OK, here's my advice.
Bring the weight forward slightly until the balls of your feet are carrying about 60% or more of your mass and are in control of your body orientation and movement.
Bring the shoulders forward. Roughly, you want the rear of the shoulder joint (not the scapula) about in line with the fornt of your pelvic bone. (at least that's the way it works out on my skeleton).
Beyond that, play with the position of your elbows. Try them both rotated lower and higher using the same stance you are using. This will greatly affect what part of you is absorbing the recoil. The elbows should not be locked, but the moder isoscoles stance should be creating natural muscular tension without you doing any real work.
As far as your hands. You Might want to try rotating your thumbs further forward. Your off hand looks like it might be good, but your strong hand looks like it could benefit form a higher gripand being rotated forward slightly. Unfortunately this is hard to tell form heavily compressed video. But you should feel some tension in the muscle in your off hand forearm when you have your grip locked in. Basically form the muscle that is running along the top in that position.
If you can borrow them form someone, the matt burkett DVDs have some decent grip and stance tutorials that are useful.
