I have a Turbo'd 2006 Solstice 2.4 LE5, it sees 11 psi daily in my daily driver. Werks turbo kit, 60 lb injectors, high flow cat + magnaflow exhaust, LC-1 Wideband, HP tuners MVPI Pro (monitor Wideband and Fuel Pressure). When I purchased the car, it was running 8 psi on a hack job tune with random hack job wiring under the hood. The tune was horrible, you WOT at 3200 RPM it would go 8:1 fuel ratio and bog on it's face. The PE Enrich table represented the Himalayas.
After 40 hours of tuning/scanning:
My PE Enrich is commanding 11.3:1 Fuel across the RPM range. LTFT cruises at -/+1. I tuned the VE table, however I disable it early in the 2000 RPMs range and use MAF for the rest. I wrote a timing curve from scratch, literally looking at google images of maps and building the matrix.
this guide for the LE5 E67 PCM with non-existent VE tables as we know them:
http://www.camaro5.com/forums/showthread.php?t=196696