Last weekend I sailed with my Nacra F18 (2005) together with other two F18 boats (one Tiger and a Hawk). The wind was maybe 15 kts (or more), upwind the two other crew were on trapeze, with one hull flying. In the same wind, and same tack, I was not able to fly the hull, even we were just sitting on the hull. We had considerable less power, consequently less speed…
If I sheeted in the main correctly, it was bending the top of the mast, even I had no power on the Cunningham. The top of the main became flat. With less main tension the top of the main remained open.

My setups was:

crew weight 160kg == 355 lbs
spreader rake 35mm == 1.4inch
diamond tension 39
mast rotator a little bit in front of the dagger board case
Jib sheeted hard,
jib slot: 1-2 inch between the end of the spreader arm and the jib

Any idea what was wrong with my setups?

Ps. Sorry for my poor English.