Floyd, I got some real good friends from LA
That is to say Lower Alabama.
Brian sent this link - http://www.serenitysys.com/MB/Service_Info/Turbo_Tweak/tweaking_the_mercedes_617_turbo_.htm for adjusting the wastegate, doesn't seem too hard, but I am going to try it when I can take 2~3 days to do it. Does not look like the kind of job to do before that cross country road trip, or in my case, when you wife is expecting the next progeny.
The black smoke is bound to be unburned fuel. Have you made any adjustments to the ALDA? That was where I was headed when I started this thread, and will end up there eventually, after some other overlooked procedures get attention. Does the top of the ALDA look like it has been opened? My understanding is that the ALDA increases fuel delivery during hard acceleration, and the adjustment procedure seems to be open it up until it smokes, then back it off just until it stops.