Are you able to change the servo mode on that radio? Might be some incompatibility. I destroyed an analog servo once when I switched models on my radio and didn't realize the transmission mode doesn't change unless you turn it off and on again. It basically hummed itself to death.

I know the this servo is digital. But maybe Airtronics super high frequency isn't compatible.

How much is it vibrating? I know this is a hard thing to describe.