Next time you change the fluids, try Redline 80W Gear Oil with ShockProof(tm). You'll feel a nice difference in shifting. Yeah, it's only 80W, but it works just fine and is a nice improvement.
Add a breather tube up the frame or replace the vent.
Hell, that bike isn't completely broken in yet. It can take as much as 10,000miles (16,000Km) before everything is settled in and feeling good.
Enjoy,
jdg