Well,..... I went ahead and trimmed the aileron wing tips and the outside edges of the elevator. Im not sure of exactly where the flutter came from but my guess would be the ailerons. All the linkages are slop free and I think I may also try stiffining up the stab with the bamboo as suggested. Ive added a pic of the new modifications. Hopefully,... I'll be able to see if it helped this weekend.

Thanks,
FUZZ