Ok, I think it's fixed.
I made 6 3/4" of the outboard end of the strip aileron fixed and cut to free the rest. I did this by removing the covering material in the gap on each side and glued in a strip of tri-stock than made the cut. Then I sanded flush and recovered. Instead of karbonite geared servos, I went with HS-9585MG, over kill I know but I want to be done with it. No weights were used.

I must have nailed the position of the new outboard trailing edge because I needed zero trim adjustments. As a matter of fact all control surfaces are perfectly centered for level flight. After three hard flights with speed dives, all linkages are tight with no sign of trauma from flutter nor could I hear any flutter. I dialed up the servo travel to help make up for the control surface area I took out.
It's slightly less responsive at landing approach and consecutive roll rate at speed is less, but stetting up for a pylon turn it's hard to tell any difference from before.