I've sealed the hinge line, got rid of any slop, . . . I rebuilt the wing, and instead of full length, I kept them short 5" from the tip, and kept that solid. Kind hard to explain, here's a picture:
The plane is proped for 140 plus mph. Would wing tip plates help? If I angled the tips back (kinda swept) help? So that the LE is longer than the TE. What will stop the high speed flutter, without causing extra drag? Does AR have anything to do with this? I've had suggestions of chopping the wing at the end of the aileron, and tapering the ailerons back from nothing at the tip, to full width at 5" back.