Loads of great examples. There are so many ways to create Flutter..... I had on my Ultra Sport 40..... She hauls booooty..... She has a crazy effect on my knees when she flies so fast, they start shaking. But.... When I first started bringing her up to speed on high speed passes I could hear the flutter and I also had to back off... I built this plane for speed and I had the controls tight.

I brought her home and sealed the gaps between ALL the surfaces and now she is slick a can be....

Looking at your set up I would say that you are getting your flutter from your "trim" bend you put in your Aileron control rod. Replace that rod with a straight one that has threads on ONE end so you can adjust it to fit and you might get rid of your flutter.... Separate servos might work as well... But I am willing to bet your issues with with that rod and the kink you put in it... That works well with the small park fliers, as they don't fly as fast and don't have the control surface loads that the larger planes have on them.... Keep her flying!!!!