Mild backfire

Finally have my 750 twin running. First time it has run in 5 years. It's running great now, starts instantly, idles nice. Only issue is the right side cylinder backfires in the muffler. Not badly, just mild pops every few seconds. Does it at idle and any steady rpm. Left side is fine. Could the float be a bit high? All jetting is stock, and left side doesn't do it is why I'm thinking float level. Just such a pain to remove carbs, I'd like to do it one more time and be done with it.

Before digging into the carbs again check all the joints on that exhaust. A joint air leak will allow any unburnt fuel in the exhaust to ignite on the next combustion cycle.
If there's no air ingress it can't combust.