I have an 04 LS6 engine and computer in a Factory5 GTM with twin turbo's, 2BAR OS/MAP on the dyno right now. The high octane and low octane tables are the same, the TM has been 0'd out, as well as all the Spark modifiers (that I can find, maybe I'm overlooking something).
At WOT and only 3-4lbs of boost, trying to get about 21-22 degrees of timing, based on the High/Low Oct tables, but the scanner shows only 14-12 degrees. Here is the data log and tune file. . .