At the recent Euro's I found a new sitting position for myself during the windier races. I sat on top of the rear beam almost pointing forward. I grabbed both the tiller and crossbar with one hand slightly behind me. Considering the runs were fast and 1 mile long it was a very comfortable ride. I also trapped at times and crouched in the middle of tramp at other times. You've just got to keep moving around to suit the conditions.
Putting surf wax on your tramp is an excellent way to stop you slipping around wasting valuable time and energy.