The little bipe described, is a classic case of " do very small, light models really respond to the rules for man carrying sized craft?" question.
my own findings are that:
A, you really can't make it light enough to simulate the flying abilities of the big un.
B, The very best one can do is to make it as light as possible and disregard the airfoil-
Rather choose a foil based on the strongest -light"streamlined board " one can make.
as for relative AOA of upper and lower panels - keep em the same -Al of my own attempts with small (as described size) stuff like this is that the only things that mattered were wingloading and CG.
You can't overpower it . it is impossible.
However- if you figure out how to do that - let me know .