Hi Ed,
First, really nice looking airplanes!
As for the Arrow's aileron sensitivity - the CG has little, if any impact on aileron sensitivity much more so on elevator response (which is not the problem). You did not indicate how much actual throw you have, but I would guess that you have too much throw, especially given that you have an '80' for power (plenty of airspeed). How is the aileron response at low speed? I would try reducing the throw by %25 -%50 of the current maximum. You can probably remove the nose weight, too. The Arrow does not have an exceptionally long tail moment and with an '80' sized engine, plus retracts it is pretty hard to get it tail heavy.
Good Luck