I'm really not sure if this applies to the question your asking but here is a pic. of the servo set-up I built for a flapperon system for a Midwest Aerostar .40. The servo shown is the servo that controls the ailerons via a piano wire that runs through a hardwood trailing edge and into the aileron. This is my second plane like this and the other plane was built without the flapperon system. Both have/had a high speed flutter coming out of a loop or in a dive at full throttle. I am sure it is because of the slop in the hardwood trailing edge where the piano wire goes out to the aileron. The reason I'm sure is because the control point broke out during an emmelman and I had to fight the plane to the ground with very sloppy alieron response. I flew it around and the roll rate was about half of what the plane usually was. At the bottom of the system in the pic is where the flap servo used to be but has been replaced by laminated ply spars. The white arrow points to where the linkage used to attach to the slide for the ailerons. This is what broke loose.
I have also built a Midwest Mustang .40 (10 years ago) and if I remember correctly, it had a plastic sleeve on the wire where it went through the wing to the aileron and did not have any flutter that I can remember. I ran the Mustang on 25% fuel and a APC 9-7 prop and it was very fast. I fly the Fox .40 on all my small planes and consisently out run my friends O.S. 46. (My Aerostar vs. his Durastick)
I guess the point I'm trying to make is that any slop or play in any control surface hinge or linkage can result in a possibly destructive flutter.