Hang on... lemme call the WWAAAAAHHHHHMMMMBULANCE.
You've got more length and way more sail area and a I/N-20 owes/has to give you between 1.5 and 4 through the wind range. You can't compare any number to a SC20 tr that number is whacked and always has been.

SuperCat 20 TallRig n/s SC20H 63.8 67.1 65.0 63.6 59.8
........ARC 21 ODR spi ARC21 61.8 65.3 62.7 61.1 58.0
..........Nacra 20 Slp spi N20 59.3 61.9 60.2 58.5 57.6
Please!

" Because of thebeam I am usually in depower mode except downwind, awesome bouancy even w/o spi. but still will fly a hull in nothing wind with 400 lbs crew weight." Sounds like a good lake boat, you should bring it to Spring Fever.
Tawd


"I said, now, I said ,pay attention boy!"

The cure for anything is salt water - sweat, tears, or the sea
Isak Dinesen
If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most.
E. B. White