If it's really bothering you and you have the ability, and a long shank straight tip screwdriver, you can sync the carbs on the road.
Remove the lower side fairing from both sides. On the left side find the vacuum hose on top of the heads. Plug the hose (since you probably don't have a vacuum guage you'll have to plug the nipple too). On the right side there is an opening in the back of the vent that has a rubber plug that is kind of oval with a flat side. Pull the plug out, and with a flashlight look upward until you see a screw that will be in a direct downward angle line to where the rubber plug opening is. Start the bike, and adjust the screw.
When you get the chance find some one with a vacuum gauge to set the sync properly.
Had this happen with my 1500 on a trip,. turned out to be a bad fuel stop and a can of carb cleaner did the trick with the gunk or water, whatever. Hope you have good luck. I never had a carb sync problem in over 150,00 miles, but I guess it could happen!