Never had my carbs right. Above 2thou it's as sweet as a nut, but around or below, it misses and chugs, like a lazy plug or something. Damned annoying when trickling in traffic. It chocks like a tractor, and pulling away smooths it out. Does the same thing parked and in neutral. I've vacced them. Shop has vacced them. Had them balanced. Waste of money - exactly the same.(Unless they did sod-all and just charged me for the privilege! wouldn't be surprised) Anyway - mine has the needle wavering up and down when at tickover. I've had it wavering now for 2 and a bit years. I am resigned to just saying "oh sod it !" - and putting up with it.
It never gets better, or worse, and has no apparent ill affect on the bike. Just get above it on the rev counter when in traffic.