I am currently running an 80533 1250 that was converted, you won't be unhappy doing so. Try removing the intermediate air bleeds altogether and change the MAB's to 25, that should help a little. The closest to a comparison I did was going from an old style 9375 to a half converted 8896, primary only, and picked up .03 the next round. It was a day race and getting warmer. Instead of finishing the 1050 I used the blocks to mod the 1250 instead. I have one 1150 changed over and the other one clean to build stock, just haven't had time to finish and test. An O2 system like the Innovate is a good investment if you can spring for it.