plus there is something wrong with how they are handling the main. They let the sail out too far, or too much camber or ?. The sail seems to drive the boat over.

Speed, wave, and too much power in the top of the main. On a A Class, when I get some of those things wrong, I hear a "wooof"/"pooof"/"pop" sound from the top of the main when the wind catches and it's all over. I wonder what sound a wing sail makes.