If you could momentarily forgive my naiveté, I’d sincerely appreciate it.

Being from the MB side, it could very well be that your setup is entirely different. Our motor’s fuel supply is a returnless or deadhead system. Hence, the pressure supplied to the injectors is entirely dependent on that generated by the pump. There is no regulator with which to adjust their pressure.

To wit:
M112fuelrail-1.jpg
M112-SLK320fuelsupply.jpg

The injectors themselves are an entirely different matter. Consequently, there is potentially substantial horsepower to be unleashed from supplying proper air/fuel ratios at WOT. stallion8797 stated, “…At 3bar the Crossfire's are rated at 15.1 lbs/hr and the MB ones are closer to 16.8 lbs/hr...”
I’ve some MB spares readily available if you’d like to borrow them for flow testing.

No worries on missing your track date. It’s happened to me far too often when business or family has taken precedence.

Good luck with your project.