I don't know if you ever got the information on the cloudy, irregular blotches on your Swayze mirror but I had the same problem on my 24" f/4.2 Swayze. These spots occur when the quartz overcoat starts breaking down. This allows air to come into contact with the reflective aluminum undercoat. When air contacts pure aluminum it instantly causes corrosion of the aluminum. Once the process starts you cant stop it. I waited untill it got so bad that it started affecting the contrast of the image. then it was off to be recoated. I see now that Swayze is no longer using that coating service.