ISB 6.7 CM2150 problem

[Stovedude]

2011 Freightliner M2 106, 6.7 Cummins ISB CM2150, 90k miles. Bought at an auction in this condition. Idles fine, but can't rev past 900-1000rpm. It starts to sputter and lets out excessive gray exhaust smoke. Turbo spins but no boost. You can hold your hand over the compressor outlet and stop the flow. Did the d3man, along with the DPF/SCR/EGR, which helped a little, but it's still struggling. Pulled the turbo apart, and found the VGT gear to be sticky and misaligned. Realigned and cleaned everything up so the gear moves freely now, and put a new actuator on (calibrated with Insite 8.9). Idles better, but still the same problem. No active codes. Changed oil, filter, and both fuel filters. Did a cylinder cutout test, and each one caused it to run slightly more crappy. Starting to think someone put gas in the tank. Is there anything else I should check? TIA.