Hey Mike,
This is problem that alot of people have had, including myself. Maiden flight, lost both aileron servos due to flutter. Couldn't recover and took hit home in a bag. That took along time to get over. A member of our club flew his sig cap today for it's maiden and the same thing happend. Completely tore the right aileron off. He, like yourself was able to limp it in to fly another day! Most people don't get a second chance. I have talked to Sig but they were no help at all. The one thing they did say was you have to use metal geared servos. As to the reason why, I personally think it is a design flaw with the aileron itself. not sure if it is the weight of the control surface or if the surface area of aileron is to large for one servo, either way I would use a metal geared servo. also, make sure to use a short servo arm. your control throw will be reduced but you will gain some mechanical advantage for the servo. Hope this helps and you get back in the air.......and stay there

Airborn