Haha - I love that you wrote I 'schooled' you about the knee technique B! Something I'd been teaching for years finally stuck with me this day - still wondering why I can't get over as far as you guys but wondering how far in the back seat this might take you? I'm busy critiquing style here from the great photo you guys took of me on this epic booter-bluebird-hero day - wondering if this info might help anyone without a racing background. Good knee form - my back knee is actually getting pushed out in the opposite direction to the front, to make for a good cowboy stance (centers weight on board and actually bends the board that little bit extra - try this while just sitting in the snow to see what it does to the board. You can really feel the board transition faster from toe to heel...), but my shoulders could be a bit more parallel to the terrain, and I could certainly stand up more - used to have the 'bent at the waist' problem back in racing days while trying to get lower all the time.. had one coach fix that for me, but it means no butt-dragging or tummy-shots!
Conclusion - left arm could be lower to bring center of gravity more over heel-edge of board, less bend at the waist. Otherwise, dragging anything generally screws up technique, but sometimes, who cares!!