I did skim back over the thread and noticed it was a 30cc airplane. What model # are those Hitecs? How long of a servo arm are you using? Are you using ball links? Are you using the stock servo arms?The LIFE batteries you are using will top out at close to 7V so the additional power gained from that may have been what allowed your setup to work until the battery dropped down to nominal voltage. Do not do any mods to the airframe just yet such as counterbalances or cutting on the ailerons. Things like that are not what is causing your issue. I have built many 35% to 45% airplanes that had the ailerons all the way to the tip. Some of those airplanes had over 200 sq. in. of aileron per side. The more information you can give me the faster we can hone in on the actual cause.