Not sure this could make your noise, but is there any chance your friction disc is in backwards?

You can also swap the carbs from side to side with a little careful cable routing. That would certainly answer your questions.

The model number is normally printed above the pivot, on one side, on the outside

I have a San Jose BMW top triple on my '84 RS, and a TT on my G/S. Both are great products. Not sure why you would need anything in addition to on...