There's really not much you can do with a closed loop chip as no matter where you set the fuel pressure or what injector you have in there, the computer is always trying to lean to 14.7:1 A/F which is set in the chip and no one changes this because you can't simply change that value w/o changing a lot of other items.
You can reset the ecm but when its learning it will get to the value that it wants to have and your eyes will keep on burning.
With a open loop chip you can play with the maf numbers around idle and change the default open loop A/F as long as you make up for the removed fuel when you go into PE via either PE/RPM or MAF corrections.
Plus its always worse when the car is warming up because its running off the richer open loop value anyway as the car warms up.
Happy motoring..