I also used an 820k6 belt which was sized correctly, but had to do the same thing you did with the compressor bolts. How long did it take you to turn those bolts? It only took me a mere 2 hours for 3 bolts and another 15 minutes to make sure I had everything the way I wanted it. So, yeah, no time at all...Well, in the end it did involve cussing!
The belt fit fine, but in this car's case it did slightly rub on the compressor pulley.
I ended up removing 3 of the compressor bolts. The upper left, and the 2 lower ones. Loosened the upper right bolt so the compressor dropped at an angle which moved the pulley away from the belt. Cinched that remaining bolt back up so it won't rattle.
The cussing was directed at the near impossible to reach upper left bolt which could only be turned an 1/8" at a time. :banghead: