What needles are you running in it right now? If you are running the original needles you are probably going to find out that you will never find just the right balance (rich pilots, lean needles and rich mains). MrRiggs has done quite a bit of testing and found the best performance on his bike with I believe 38 pilots, gjh needles on the 5th slot and 138 mains. I am now running 40 pilots, gfh needles on the 2nd slot (1/2 step richer than gjh on the 5th slot) along with 140 mains. I have no idea what my gas milage is but it runs very strong and I beat the piss out of it (hard acceleration, hole shots and lots of engine braking) when I am out playing around with my riding buddies (1 has a vn750 and the other has a zx-7). Also you may want to check for obstructions with those filters. I switched over to Uni PK-92 filters from K&N's and it "seems" to be smoother.