A few more thoughts:
The stabless normal profiled wing will be the lowest drag and most efficient, IF the rider can control it sufficiently for max performance that is.
Meaning, as a comparison, just like if you had a kite without much or any bar/rear line feedback you would over and undersheet it very subtle without knowing (feeling), thus it will not perform as good in reality eventhough it might be the best in theory.
This could go for hydrofoils too, or not, time will tell.
As we stand so high, thus change AOA very slowly because of this lever, I think one can indeed control it, but difficult to say.
A reflex wing will never be as efficent as a normal wing with a stab when lifting, as this design is a compromise, eventhough they work quite okay at higher speeds indeed.
But as both Denise and others know, it will work quite well for "freeflight or freeride" and lively.
Also, the lower drag and ease of not having a fuselage and stab, might outweigh so it goes even up, and MUCH simpler with only a frontwing and short fuselage
Looking forward to more tests
PF