Tony, I think you said the same thing I did although I'm not sure about lower wings needing more. It has been my experiance that high wings tend to yaw more than low, but that may just be the case with the models I have flown. Also planes rotate around the center of balance, this is a point somewhere in the center of the fuselage where if you could suspend the plane it would be balanced in all 3 axis. I also belive that the angle of attack is relitive to airspeed and wing loading and is not a fixed angle. However being old with only 2 active brain cells I could be wrong ;-}