If you still have a good 2H pencil- here is some "engineering "work you might try:
Make up some quality 90 degree bellcranks and get some decent small ball joints.
Place aileron servo inside fuselage - and drive each aileron at two points (aprox 2/5th from each end) Most importantly - interconnect ailerons
This setup will provide maximum resistance to flutter -for least amount of power applied .
It doe not replace proper aileron design or good static balance -but it will reduce air loadings to servo(s).
Dont believe it ?
look at any decent full scale aerobat.
For a larger model --- place one aileron servo at inboard edge of each aileron ---then drive an additional point at other end of aileron with push rod.
Interconnect the two alierons thru fuselage.
Same idea -just less bits n pieces.
And what ever you do -do not use torque rods!
In these sizes - you simply end up with a device which can easily go resonant.