No expert myself, but learning a bit doing logs for a custom tune on hybrid turbos.
Could be heaps of things going on.
Tune parameters, fuel settings, aftermarket inlets, vac leaks.
Really need to log a non track pull, in 3rd gear, manual mode, traction control off, 2k to 6.5k.
Would look at a custom tune, with upgraded inlets, even with stock turbos, if tracking a bit, there are gains.
MHD V10 2+ has a lot of issues ironed out and more flexibility, maybe try that.