I know this is an old thread but...
Am I being stupid??
It's a diesel, why should you not accelerate from 2k??
That's where the power is located.
I do and mine is fine, not like on/off hard driving accelerating.
I have a mediocre map, nothing silly BHP or Torque wise, get no judders, shudders or anything, only gearknob area rattles in 3rd telling me i'm in too higher gear for the speed i'm doing.