AVS carb metering rods & step up springs

Yes, you could. A slightly leaner rod should do it well. BAsicly, you actually want to run a hair lean with the AFB/AVS carbs. It provides better accelration and overall idle and driveabilty's. Come winter, it should require nothing more than a twist of the screws (On the front of the carb) to richin it back up for the cold.