What kind of mileage are you getting? Just for fun you can check it against what the gov't thinks your mileage should be on you car. There's a thread on that in diesel forum right now.
I also remember a thread a while back on adjusting the EHA on higher milage M103s to pick up some of the general "slack" in a well worn engine. Search for it the archives. Can't remember if that was to correct a lean condition or the other way around...
Good luck...there's only a select few of us obsessed (or stupid) enough to try and match wits w/ this damn injection system MB stuck us with.
-M-