Maybe your bike doesn't vibrate as much?
I have GP touring bars on my bike with bar-end mirrors from Emgo. All's I can say for the vibration is, get squishy gel grips. And don't get Emgo bar-end mirrors
They work well from 0-40, but above that all you can see is that there may be a vehicle behind you, and you can't tell how big or how fast or how close, since everything is a blur (and the attachment mechanism is pretty cheaply constructed, too)