For those having issues with acceleration times. Take a look at the engine temps during acceleration, If the temps are approaching the limit of 800C, the ECU will slow down the acceleration to compensate. You may need to pull the thermocouple out of the nozzle a tad, sometimes they get pushed in during shipping. The tip should only enter the nozzle by a few MM.
Pump limit Will affect acceleration but I don't believe this to be your issue.