As much as I hate to say the following thing it is true nevertheless. A boat design can be TOO light to perform to its full potential.

I won't go into detail at this time, but suffice to say that the ratio of wetted surface area to bouyance (=overall boat weight) does play a factor, as well the ability to hold some momentum when sailing through choppy seas.

Also the first thing a good engineer needs to learn is that it is very traiterous to extrapolate (approximated) behaviour into extreme points.

But these are all topics for another time.

Wouter