OK-then why do most (if not all-Ihave not seen all of them) light aircraft have heavy counterbalance forward of /at hinge line.
It does nothing for aerodynamic balance.
Anything (almost ) can be made to go resonant-sure -but leaving the C/G of the aileron at it's trailing edge-simply invites destruction.
I make all of my own aileron designs as stiff and as light as possible - then balance to 20%-or further forward.