A trim tab on the wing tip will not cause flaperon flutter.
Joe Gores
No need for aileron trim tab. Trailing edge squeezing works great. DO it A LITTLE BIT AT A TIME! Small squeezes make big differences. Avery wedge works great. I used one full tab on left side. Looks good and won't get bent accidentally like a trim tab. See here: http://www.mykitlog.com/users/display_log.php?user=BigJohn&project=639&category=0&log=123536&row=38
and here: http://www.mykitlog.com/users/display_log.php?user=BigJohn&project=639&category=0&log=134756&row=2