I had to rebuild my ailerons which started fluttering when approaching
175kts IAS. The ailerons should essentially balance horizontally when
suspended from the hinges. If they are tail heavy and the wing starts
shaking the aileron tail "shakes" in opposite direction to the wing.
But that is just the orientation that will help the wing shake even
more which in turn will shake (flutter) the aileron with an increasing
amplitude - with possible destructive effects. This is a forced
resonance effect. If your plane is slow this scenario may not effect
things much. But it all depends on wing mass, stiffness of wing
support, etc. In my case I had to include more weight on the front part
of the aileron to balance.
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SQ2000 canard: http://www.abri.com/sq2000

wrote:
Is there a simple (or complex) guideline for the relationships between
CG, pivot axis and aerodynamic center for a control surface to prevent
flutter?

Is it as simple as keeping the CG at or ahead of the aerodynamic
center, similar to designing for stability of the aircraft itself?

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FF