I'm 85 kg (188 lbs) and 1.85 mtr (6'1) and I have no problems what so ever.

I also race the boat doublehanded at 150 kg, no problem there as well with me being the crew

The boom on the F16's is actually rather high, as is typical with spinnaker boats. Good clearance under the boom is important in spinnaker sailing. The fact that the hulls are shorter than most boats out there doesn't means that everything is smaller. As a matter of fact we have the same boom height (sometimes even more) then the F18's and F20's. Boats like the A, 18HT and M20 typically have very low booms near the mast.

Wouter