I haven't read this whole thread so maybe someone has thought of this but if the wings were allowed to rotate freely (sort of like a max prop) could you set a stop so that when the rudders are down the axis or rotation causes them to take the path of least resistance except that when bows go down X degrees the wings hit the stop, and then when rudders are kicked up they continue to take path of least resistance. This would seem to solve both the issue of light air drag and moving with rudders kicked up.