Hi John,
sorry for the late reply, I was out flying the large aluminum tubes around the country.
I do remember you and that you have the big U-2. Thanks for your input to the large wing roll problems. I'll look at each point you brought up. I was going to plan to not incorporate flaps initially since I'll have the scale speedbrakes. But the Reynolds number is significant. Roll spoilers look more promising though the early U-2 did not have them.
I have incorporated a more semi-sym airfoil as the wing progresses toward the tip giving aerodynamic washout.
Jack