This is an interesting topic.. years ago we sat around talking about trimming like this. A symmetrical airfoil has to fly with some positive incidence, there must be lift someplace to keep the plane level. If you change the wing incidence, and retrim to fly level I think the wing still flys at the same original incidence - it can't change or the plane climbs with a change of airspeed. Adjusting wing incidence only raises or lowers the stab while in flight, which puts in more up or down elevator for level flight. Although I understand Jock's comments, and I'd try this, not sure it will work - but give it a try.. and I'd also play with thrust, but not right thrust - up/down thrust.

Scott