All I can suggest is to make everything as adjustable as possible. Mount each wing and each stabilizer so that the angle of incidence with the fuselage can be adjusted as much as possible. When making airfoils, they aren't going to be perfect, so making things adjustable allows for you to decrease the lift being made by your slightly more efficient right wing so that there isn't a constant left roll.
Aside from that, I'd just say experiment a lot, make a lot of different stuff and try it all out. I once had to design a plane with max wingspan of 11" to fly in a 24 mph wind-tunnel. I think we worked on that thing for a total of about 300 hours, and we eventually had about 10 fuselage designs and about 20 sets of wings, all interchangable, to work with. We kept trying stuff to see how it would work, and we eventually honed it down to a combination of 3 sets of wings on one fuselage that worked out well.
Twin Cessna 812 Victor, Minneapolis Center, we observe your operation in the immediate vicinity of extreme precipitation