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I went throught the same tuning my car. I Followed the same procedure as you, when i put the car in closed loop same thing happened.
My NBs were waay off from my wideband. I too had the same ordeal...

http://www.hptuners.com/forum/showthread.php?49363-LT1-24X-411-PCM-conversion-all-of-us-please-step-inside

I dont know if PSI swaps the injectors in the harness or not. But it looks like the...

I have a GMC savana 4l80e file 411pcm with the same OS i need a 60e trans segment.

forgot to mention i run xp and bootcamp then parallels and 7, boot camp and xp are from my experience much more stable and operate better. Apple techs ive talked with also like bootcamp better.

boot cam works better than parallels, i use two macs one with parallels and one with boot camp. The only plus side to parallels is copy pasting from mac onto windows and vice versa