Git rid of the paint, it's not suppose to be there. I see many like this and like yours the stuff is peeling and falling off ...... so what do the restaurant owner often do?
Repaint it!!...............grr Ever wonder of the accumulation of bacteria in that paint?
Just have it cleaned to bare metal....that's what code (NFPA 96) recommends.
Hope it helps
Oh man where to begin......
Vibrating = Out of balance
Also turn fans off before you pull your filters out this will prevent the "grease globs" from being pulled onto the fan, thus causing it to go out of balance. Then wipe the upper track that houses the filters. And of course wipe lower track,and empty drip trays. Then throw cleaned filters back in place.
Hope this helps.