My MSR had pretty bad TBE out of the box. I checked the blade grips, balancing, tracking, feathering shaft, flybar (I even tried the spare), ball links, linkages, anti-rotation collar, servo mounts, main drive gear, tail boom, you-name-it and after two weeks she still wanted to dance around. Don't get me wrong people, I like to love the ladies but I was getting kind of frustrated with her. When I waltz, I like to be in the lead if you know what I mean. There was one last thing I hadn't tried with her yet because up here in Canada, spring hasn't quite yet arrived and as we've only been able to play indoors I hadn't tried changing the linkages from the short arms to the longer arms on the swashplate. Well last night I sez, "Hey, honey. Wanna polka?". I can't believe it. She answered me by floating in front of me in a near-perfect hover. I'm in love all over again.
The three things that cured my TBE was getting the right torque on the blade grips, ensuring the main drive gear was in its proper spot on the main shaft and going with the more aggressive swashplate setup. Ain't love grand.