id stay with the standard item at that power level.

or if you want to change it for peace of mind or the worry that yours may be to old and not work efficiently, id then say go fo a Bosch 003.

if your thinking of upgarding power levels again at a later date then go straight for the Bosch 023 pump and be future-proofed.

aniother good thing to check is that you are definatly seeing a steady 12v supply to the pump at all times.

HTH

Kelvin.