Sorry to hear that PL. My Axe did the dance of death once too when I accidentially hit the idle-up. It actually didn't cause any mechanical damage, but the 3-in-1 smoked a bit. For me the worst thing about the stock Tx is no way to inhibit Idle-Up. My Axe hasn't done the dance since then again my 7C has both Idle-Ups inhibited.

I'm curious about your tail issues. If your using the 3-in-1 then that's most likely the cause, but if you went seperates then it's a real mystery. If you are running seperates what gyro are you using?

About the bad vibes. Measuring doesn't always work. Here's my method. First I balance the flybar then I install and balance the blades. Works every time.