L31MaxExpress
I'm Awesome
Reading back through your posts and looking closer at your screen shots. The MAF, MAF calibration and or VE tables are definitely out to lunch. Bad or wrong injector data programmed into the PCM could also be contributing to the fueling error. Those long term fuel trims are sky high and it is also showing up as an extremely rich WOT air/fuel. Your narrowbands are reading 950mv and 980mv at WOT from all the added fuel the long term fuel trims being nearly +20% are causing the PCM to add. Even at lighter throttle the long terms are correcting for an extremely lean condition in the base fueling. My buddies truck with the extremely rich 11.8:1 commanded power enrichment air/fuel ratio and zero'd fuel trims from me correcting the injector data on his otherwise stock truck with LS1 injectors is running around 900mv on the narrowbands, much leaner. If you get your fueling corrected, I bet that engine wakes up alot.
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