Trebeck, get your back knee stabilized under your hip. You are in a pretty good position at your split, other than the fact that your hips and forward movement is leaking away from your backside. As you continue down the hill, your back leg is forced to extend early because your lower 1/2 is gone (look at back knee position you should have a good line from hip to knee to ankle. You have a break in the chain, so you are left only to drive your torso and head forward to get down the hill, cuz your brain is telling you, we have to get out front. Whereas if your backside was under you, you would be able to carry yourself down the hill and maintain a better pelvic angle, riding your lower 1/2 to your foot plant. I agree with the comment of your inverted W, but not to the extent that it is the reason, your lower 1/2 is non existent. Sorry for typos, I am in a bit of a rush. I try and keep it simple. But the deliver starts from our feet. Take care of the lower 1/2 and you will be much further ahead when you begin to work out other needed tweaks.