2000CamaroSS29072

I've recently added long tube headers and blackwing to my 2001 Corvette A4 coupe with 2.73 gears. I've purchased a 7198 Predator rev 9r09. I've read several posts on tuning for fuel and timing. I've data logged for my 'ltft'. I was coming up with a average of +5.47 on a 20 mile cruise on the interstate with throttle at 20% and 1900 rpm. I then changed my injector slope to -6. Now I'm running at -.78 to -1.56 while cruising and it goes to 0 at WOT...which is perfect. Next, I checked my spark advance and O2 mv at WOT. At WOT, I'm getting 25.50 for spark advance and .90 mv at the O2 sensors. From what I've seen, I should be around .93 mv with long tube headers. What should I adjust next? I've seen some posts from, I believe 06MONTECARLOSS(Lew), to add +6 to my PE since I went -6 on my injector slope. Will this bring my O2 mv to .93? When I adjust the timing, mine has three different rpm ranges to modify. Do I add 1 degree at a time to each rpm range. I guess my 7198 rev 9r09 doesn't go by % advance...it goes up 1 degree at a time. I know I looking to be around 28-29 degrees and a being at 25.50, I can go up 2-3 degrees. I'm watching 'maximum knock' because I don't see one called knock retard. My maximum knock is at 0. Can anyone give me some advice on getting me where I need to be. Thanks in advance.

Mike