That is an asymmetric foil, i.e it produces more lift at positive angles of attack than negative angles of attack. My understanding is current straight foils are symmetric. Otherwise you would have to tack the boards when you tacked the boat.
what's one more string to pull!?
Seriously, that may be the best idea to come out of the days discussion. Asym, tacking boards. Set up properly in shouldn't be too big a problem, particularly if there is a bigger gain to be had.
