If you've hit the point of diminishing returns on the barrel adjusters... Shift into your biggest chainring and smallest cog, then screw the barrels all the way back in (which is actually turning them left, NOT right), then back out a full turn. After that, loosen the cable screw and pull the cable tight again (not so tight to where it messes with your limits, but hand tight), then tighten the screw back up, making sure you're still in the cable groove. If you're still not shifting smooth from there, back the barrel on the derailleur a quarter turn at a time until you're set.
Or, take to your LBS and get the complimentary (at least it should be) post-install cable tightening.