I have the 92 400E that came in 2nd to your 560SEC in Brookline. I have my snows mounted on my 15s and swap to my 16s for the summer. I just swap them back for the show, it only takes about 20 minutes.
I lost some points for having small pits on the plastic fog lamp lenses (new ones are on order) and I also lost some points for having a cell phone bracket for an old MB phone that was installed when new that was taken out when handhelds became the way to go. I found an MB factory phone on ebay so I can have it in place to show. (dealer installed factory options are acceptable as long as they are complete, otherwise you lose points)
As far as window tint goes, it kind of depends on the judges and the severity of the tint.