The mirrors are delicate, strange looking and yes they vibrate. It seems like Ducati does not care very much about the mirrors.
Vibrations in the mirrors happen because of harmonics. The firing order is called a "Twin Pulse." That is, the Right Side front cylinder fires, then Right side Back in very close timing but not at the same time. There is a rest then, the Left Front, followed by the Left Back. This feels quite pleasant on your hands and sounds amazing, but creates this harmonic that makes the mirrors vibrate. I put a ziptie and a piece of tape on one to create a tiny weight interference and it works. It vibrates a lot less. I will be selling the zip-tie and piece of tape soon in an anti-vibration package (DAV). Please leave your name for pre-orders. I'm joking. But yes it actually works.
I only use the mirrors because I'm a paranoid 'Merican in Italy who still thinks there's CHP behind him even though the po po in Italy do not give the tiniest merdolino about speeding motorcycles and chase no one ever because there are stationary speed cameras for that. Now and then the mirrors are handy.