For model planes, flutter is mostly going to be from uneven air over the control surface. Balancing the control surface *could* help prevent flutter in severe cases such as a stripped out servo. Loose linkage/shinges allow for flutter.We will probably get into it from uneven flow from ailerons, etc being installed crooked, and/or uneven gaps. Strip ailerons can get into flutter from wing tip vortices. The best prevention is to cover the gaps. I now cover mine with a single piece of covering when doing a wing, etc. The control response is much smoother, the gaps stay cleaner from gunk, and you have protection. I once had all of my Robart point hinges break loose but the covering held the big aileron of a pattern model on just fine.