Unfortunately, DRD technical support is no longer an option.
Can you think of any maintenance that was performed or symptoms that occurred prior to this sluggishness? Did the shop find any trouble codes with their full system scan? Have they monitored VGT actual vs. desired and fuel pressure actual vs. desired?
When they test drove, was there any possibility it could be transmission related?
Updating the firmware on your MM3 past the one that introduced early 2019 with the "switch" feature isn't going to help.
You could reload your tunes in case the PCM has been corrupted, but that is a long shot and highly unlikely.
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