What lol? its not off by that much if the RRFPR is adjusted to the same pressure at vaccum. Idle should be no different with the stock FRP vs the new one. its going to richen up the bottom 1.5k-3k because these twin screws make boost down low. and bring the top where it should be 12.1 at redline at 20lbs.

I dont see how you can avoid the bottom getting rich with the rising rate regulator without removing some of the fuel at the injector.

Is there a side effect of doing it that way?