ok i'm ready to be shot down in flames here but......after adjusting this that and the other maybe that isnt the problem..........have you reset everything back to where it was before you started tweaking??...you have......good................now then the problem may lie not with the fueling set up but with the injectors themselves.....have you had them serviced?? or maybe try taking the fuel filter off and filling it up with that deisel engine additive (buggered if i can remember the name at moment) it's also best to do this when you are lowish on fuel in the tank too..........then just chuck the rest of the bottle in the tank and run it for 20 odd miles to get her nice and hot.....this should improve things a touch....but i'd definately have my injectors serviced if i were you