Longer boat is certainly not required. F16 are raced doublehanded with a crew weigth ranging from 115 kg to 155 kg, your 95 is still ways of that. James Sage (also about 95 kg) raced the Taipan uni in several championships and won. I assume the other boats are not much different in this respect. However, I'm sure James did have a custom sail made as the Taipan rules allow that. Certainly not all classes allow that, Taipan and F16 class do.

That was my serious answer, my non serious answer ist that Florida has a guy that singkehands a Nacra Inter 20 ! So who are you to skipped the option of singlehanding an F18 ?

Wouter