Sounds like a deal Locksmythe!
It's definitely not jumpy... and in my M5... I not only always ran in M mode, maxed out... w/ the SprintBooster... I had the RPI (Powerchip) tune... and too me... it just felt the way the gas pedal should have always felt.
But again, not many people drive these cars every day in M mode, with everything Maxed out, and DSC off.
Peace,
Dave