I had a 85 300sd for 8 years. It was lazy off the line until I timed it. I set the static timing at 12 degrees after top dead center. I also had a new timing chain with a 2.5 degree advance woodruff key so the cam was advanced just a tad and that makes the low end come in sooner. The guy that bought my car had owned 5 300d(s) and none ran like mine out of the hole.
So make sure the engine is timed somewhere between 15 to 12 degrees after top dead center (static) and see if that's enough. If not then try advancing the cam.
BTW I never messed with my alda. I also had a manual boost controller set to 15 psi.
Another discovery was the engine started much better and got up to temperature much faster after being re-timed.
Roddy

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