-Trying to answer as best I can-
Just to clarify the fay hulls are the absolute largest(fullest/most buoyant) that can fit in the mosquito template on every measurement as well as having alot more rocker than all shapes that came before it. They can be pushed a bit harder downwind and because they sit "on top of the water" they tack a fair bit better.
Basically if you follow multihull design for the last 40 years you will see a trend from very skinny sleek hulls that "cut" the water extremely efficiently-to "fuller" hulls with more buoyancy that can cope with alot more powerful rigs and hence go quicker in a broader range of wind ranges.
the majority of wooden boats have some age on them and were built to a different mindset, it's not that they couldn't get the "fay shape" it's that they chose not to. there are a few wooden boat builders on this forum who know more, but if you have the skills and the will then making a competitive wooden boat is very possible.