How are you getting tracking set when you have a vibration? Those blades HAVE to be balanced both CG and tip to tip. Falt woodies may let you get away with not being blalnced too well......but syms are heavier and also the plastic ones........ more weight on the tip means bigger difference in rotational smoothness.
If the feathering shaft is not bent......then you need to spend the time to balance those blades to as close to perfection as you can get.

I just reread your post................ ummmmmmmmmmmm.......NM.......


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Of all the things I ever lost.............................................. . I miss my mind the most!