I was windsurfing from 1985-2003 and have been kitesurfing since 2003 Don't know about the sience.. but just an observation I usually check the forecast many times a day.. The Wind was way better in august and september earlier days More south-west gale, with rain, followed the gulf stream.. But now...
ok, if you have a (medium) soft board... what if you had a pair of stringers that could be attached (on top) to remove the rocker (or just make it stiffer)? or, as Guttorm said, switch between flat or curved fins? longer fins (not deeper) with different curves could make a difference a third (long, ...
Maybe not the lightest board but my 140x44 cm Cyclone does a very good job. I use it mostly with my Turbine 17 and Kahoona 11.5. And when I'm powered with my 11.5 I don't feel that I need to switch to a smaller board. The straps is centre offset, and it's easy to hold the edge even when the wind pic...