with the flat bottom airfoil of the kadet ,when you add the airlerons set thgem up with differential,you want more up deflection than down.this will help with the yaw induced by the drag of the down airleron and help it turn better..only other question is why a solid spar?an upper and lower spar with shear webbing is not only easier to build but is one of the strongest of all wing designs.commonly called d-tube contruction.