I wish that I could remember the article and magazine, but a ever so slight difference of the aileron leading edge actually helps against flutter. (dont ask me how!) I know that sounds wacked out.... now a centimeter or 1/4" or half inch seems way too much to me though! I would try to remedy that one. I will sight one example of a thicker aileron leading edge from my own experience! I had a great flying DP extra 330 that I added 1/32 sheeting too the ailerons top and bottom. This was added to help with the ridgidness since others complained of aileron flex on 330's. Anyway, after adding the sheeting, and recovering ect., there was a bit of a size difference from stock. It was of course 2/32 extra thickness which is not much, but was noticable when hinging. I just centered it all up and glued them in, feeling confident after reading that article that I may actually have helped the model in more than 1 way. I must say, that was the best flying model that I had owned. It flew beautifully even with a slightly (on purpose) thicker aileron leading edge. No flutter at all! So I guess what Im saying, a little extra thickness wont be a problem, if aileron is centered with equal amount top and bottom. If you have more than a little thickness though, I would have to agree with the above posts, its probably way too much! From your picture, if the bottom looks like the top centered, than I think its way too much!