Nik From what I have seen and picked up talking to others in my area that own the D.P. extra 330L the key to eliminating flutter is throttle management. I have a stock set up with a Moki 1.80 and have not had any problems with flutter. Remember this plane is meant to fly slow and be capable of doing 3-d it wasn't made to go fast. I can't think of a time when I have ever gone full throttle except on up lines. exception to the stock set up I did use pinned nylon hinges on all the control surfaces