Vibrating mirrors sounds odd. I drive a cb500 and don't have that problem. Are your mirrors screwed on tight enough? Or is there excessive vibration coming from the engine? I dropped my cb a year ago and replaced my mirrors with long stemmed, rectangular mirrors, and they are much better.

The only problem I have with my cb500 is, since I got heated grips, it runs a little poorly at low speeds (only when the grips are on, obviously). My mechanic fitted them for me and he assured me that my bike could take them. I don't think my bike has any electrical faults because everything works perfectly otherwise.