Thought I'd dig this thread up and see if anyone can help. I'm pretty sure tracing it back to this event that my motor has run slower ever since. It was only boosting to about 15psi and recently lost all boost, running very slowly. It all of a sudden went back to how it was running about 12-15psi, still low power. When under load it doesn't control boost well, and fees like it misfires.
Things I have tried:
1. Replaced all injectors (some were leaky)
2. New MAF checked
3. New HPFP regulator
4. Low pressure fuel pump filter changed
5. Boost solenoid checked and vacuum system checked

With INPA, free revving shows requested rail pressure vs actual as matched.
It very much feels like a fuel delivery issue.

There is no codes.

I'm starting to think either a HPFP ( I can't see INPA while driving due bad laptop battery.)
Or, is this some faulty DDE issue?

Any ideas?
Cheers