There's a very good little part from it available from Smokin' Paintball that dramatically improves the flow into the main chamber. All you do is switch out the stock top hat (I think that's what it's called) by unscrewing it from the back and screw in the Smokin part. It takes seconds and can be done with a coin. Not too expensive either, if I recall.
Currently, I like and use the Free Flow Bolt, Oracle, and Leethal Mod Combination with the Black Bolt Kit. But the Evolve bolt upgrades are decent as well.