I have enjoyed my 4star 60 so much over the last 2 seasons but I found a loud flutter at higher speeds and now need to retire it..... I want to build another and want to soak up everyones experience on how to build to avoid the same flutter again. Yes, my seals were all gapped and I had strengthened the stabbilizer area. I did put flying wires on the aft area....How do I put a 91FX on a 4star and get more than 1 season out of it..... please, don't tell me I have over powered it..... I've tried several engines and this is by far the biggest bang for the buck. All constructive comments gladly appreciated.