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2007 trailblazer SS.
recently swapped LS3 heads, ls3 truck intake manifold, stage 2 supercharged cam from texas speed, long tube headers and exhaust.
no vacuum leaks, new spark plugs (checked a few times) coil packs swapped, spark plug wires new bosch up stream o2 sensors, nothing fixed it.
had it tuned on stock ecm. here is some live data if anyone has an idea possibly
Post up your tune and more people will respond
Do you have your LTFT disabled? I didn't see them move once... (I'm sure that isn't your whole problem, but something I saw)....
Did you do any "Pre" tuning to your airflow tables to compensate for your modifications?
(Again, I'm thinking its not your only issue)
Exhaust Leaks?
Also if you can log MAF Frequency and Injector duty cycle (both banks) That will help.
Post tune file and I'll see if something looks amiss.