Well I have had flutter twice now and destroyed two 150.00 servos and the only other thing I can change is the rod itself. Sm said they have had issues but I checked the rods tonight and they are pretty stiff rods. That being said they do flex and I'm going to replace them as well but I think the mechanical setup change I did to the rudder did help so I'm changing them all. It's frustrating since apparently I'm the only person getting flutter with the stock setup.