Glenn Ashby's inward canted boards presently have symmetrical profiles. There are many possibilities for canted and curved boards to increase lift: many NACA shapes have been tested but few have been made up in carbon fiber. John Ilett has done many of them. It is not clear what the Marstrom profile is, or the Bimare profile. Who knows about the French???

I predict that curved boards will be developed with non-symmetrical profiles- to make A-cats fly even better! And fly they will. Fumbling with legal language to regulate this is/will continue to be ummm.....aaaa.....problematic.

Old story- Engineers say that a Bumblebee cannot fly, according to conventional aeronautics. The bumblebee, not knowing this, continues to fly happily.