Mary,

The only cat that truly benefited by actual body kinetics upwind and downwind was (is) the Hobie 14. Body weight has a huge effect downwind and because of its length, able to surf very well. Ooching the loose rig forward also gets the boat down the face of a wave. You could also ooch the bows thru waves upwind if you could get in sync. By hiking very hard and/or trapezing, you can throw your weight back suddenly and pop the bows out of waves too. The current 17-18-20' boats get stuck in the troughs or just plow into the back of the forward wave so body movement is negated if sailed straight downwind.

Hope this helps,

Bob