OK, one more time! Before you touch those carbs again, service everything else: cam chain tension, valve lash, and ignition timing (checking both advance and retard positions), in that order. Your carbs weren't "gone through" unless they were stripped (fuel screws, floats and needles, and jets removed), with every passage blown clear with solvent and compressed air, float level inspected, float function checked on the bench, and thorough inspection done for air leaks. If you take anything for granted you'll likely either be selling that bike or still thrashing around this time next year. Do a compression check while you're at it; if you have more than 10% difference between cylinders you'll have an idle stagger. If compression is in spec and everything is dialed in right and you still have an idle stagger, run a leakdown test; that often reveals defects that don't show up on a compression test.