Interesting information.

I've had good results with balanced and unbalanced surfaces, as I'm sure we all have. Still, when I've done experiments with the "balance tabs" at the ends of the elevator and rudder, those surfaces did seem to be more effective. (I seal all my gaps anyway, so I can't really say if there was a difference in flutter prevention.)

What I'm most curious about at this point is: Why do many modern aircraft tend to use the aerodynamic balance tabs on the tail, but much less often on ailerons?