I tried working on the new start position and stopping the rocking back onto my heels during my last session.
Here is a workup set at 90k: http://www.youtube.com/watch?v=FduCsD8wPxw&feature=plcp
Here is a longer video of most of my session: http://www.youtube.com/watch?v=ltcCt90A7fk&feature=plcp
I felt like I wasn't rocking back, but after watching the video it looks like I do still come back on the heel at the end of the 1st pull. You can definitely see that I drop my hip too low on the start during the heavier snatches. This causes me to push the bar away again, and then the zig zag pull gets worse.
Will keep all work light and a lot of pulls and pull + snatch combos until this is hammered out.