Mike, we raced our F18 at 186 kg initially and it hurt, particularly on the downwinds. We got our weight down to 165kg for the Worlds but still suffered against the lighter crews. We were heavy weights on the Tornado (165kg) and it hurt us there to. Every boat has an ideal crew weight. The F18 would be between 150 and 155kg, the Tornado 140 to 150 and the F16, I have not spent much time on but I believe it would be around the 140kg mark.

Additional boat weigh is dead weight and serves no great purpose. Additional crew weight carries a lot better but still hurts. If the boat is too heavy, put it on a diet. If the crew are too heavy, then put yourselves on a diet..... then work on your skill level. But make the racing about the crews, not the boats.