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Talk to your tuner and have him log the car.(I'm assuming you had the flex fuel tables tweaked during install).
It sounds like the car is pulling timing. Maybe because it's knocking or misfiring.
Which longtubes do you have? Check your spark wires, people have reported burning wires with LTs and causing similar symptoms.
Regardless I'd stop doing pulls until you find the culprit.
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'18 1SS 1LE M6 NGM|| 11.5:1 Diamond Pistons || Callie's H-beams || Vengeance III Cam Kit || Built Heads || TSP LTs 1 7/8"(C-Coated) || MSD IM || DSX E85 || Rotofab || BMR Springs || 576/472 @7000rpm
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