I polished the ramp on my bolt, just enough to remove the chatter marks, it's allot smoother now, I could install a Bolt Lift kit, but I'm going to wait till I'm able to shoot this project I have going. It's quite smooth now and I don't think I'll need the lift kit.
About the only other thing you could do (after all the Do It Yourself tricks) would have it Timed and Trued.
I'm keeping mine strictly DIY.
Curt