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Also, looking at the aileron I see its a strip type with the linkage at one end. if you hold one end of the aileron you can probably twist the entire thing into a helix from the other - attaching your servo link to the middle of that instead of at one end will increase the stiffness too by shortening the lever arm. You might even consider replacing the ailerons with something that has better rigidity or gluing another strip of aileron stock to the one thats already there.
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Strip ailerons could be a problem especially when using soft stock to keep weight under control. If you find yourself with a kit that uses very soft wood, don't discard the wood. Just apply carbon mat or veil material to the aileron surface before you finsih it. It will add a fraction of the weight of heavier, stiffer balsa stock and improve stiffness at least 3 fold. I apply carbon mat with nitrate dope. The great thing about this material is you may then finish with iron on plastic if you want to, directly over the carbon mat. You will need substantially less heat than usual since nitrate is really and industrial adhesive that gets tacky around 200 F

MattK