My goodness Rob, your form looks very very similar to what mine used to look like when I just free skied.
So let me tell you what people have told me to help me shape up. I can tell by the pictures, and as was said in the previous replys, you are pushing really hard on that back foot in the turn. Which is causing a very slow and unbalanced turn, which leads to an out of position pull across the wakes.
If you will look at your first picture posted, at first glance it appears you are adopting the new school slalom technique, but you are only partially there. As was noted earlier you should be looking directly across the wakes. I also bet that you have skimmed the wakes with your butt at least once or twice in your pull across the wakes (I used to do that a lot). You also are probably starting to have some issues with a very tight, and perhaps painful lower back. This is due to bad position, and you and I are alike in that respect too.
I was told to immagine I am in the gym, and I am getting ready to dead-lift 500lbs...what position would I want to be in? If you imagine the ski rope as the barbell, you want you entire body in line to help you take the load. So you have to bend your ankles and knees and position your hips over your feet with your shoulders back and over the top of your hips. This puts everything in line and helps you take on the load much much easier. This way you are much stronger across the wake, which leads to more speed, and more bouys in the long run.
I hope this helps a little, you look like a very strong skiier, and quite balanced, so as soon as your fix up the form you will be zipping through the course at 22 off before you know it.