Come to think of it ,, after I sealed the gaps in the aileron and elev I was using a smaller prop on my 91FX than the 15x6 I'm using now. Once while I was making a high speed pass I noticed some high speed buffeting. Kinda scary,,, and I bet without the hinge tape and extra ca hinges I would have lost an aileron from flutter.
Shakes,, were you flying pretty fast ?