As some more insight to this topic, I've been getting misfires on really cold starts (temperatures -15C or below). The code descriptions were misfires with signal cutout on cylinders 1, 8 and 3. Misfire with signal or value above threshold on cylinder 6 and exhaust-gas-related misfire after starting on cylinders 2 and 7.

I noted all the codes and instances on each cylinder, cleared the codes and within a week and on a very cold morning, it started up rough and the check engine light came on. A restart tended to clear it up and get it running smooth again. The issue never presented itself on warm(er) starts or when the car was actually warmed up. It purred like a kitten then. Well, a V8 kitten.....

I took it to an independent shop and he suspected the intermediate levers. When I had my engine open before, my levers weren't part of those described in my SIB post above. The factory default of the levers is supposed to be 0.3mm. Apparently BMW came up with a software fix that allowed adjustment up to 0.8mm. Mine were actually set at 0.1mm. So we set to 0.3mm and I'll keep an eye on the cold starts. The closer you get to 0.8mm, the worse things get - hesitation on throttle response from idle, increased fuel consumption, and a coupe of other things it noted.

Not sure if this helps anyone, but sharing nonetheless. I'll keep this thread updated with any adjustment updates.

Cheers.

__________________
Daily Drivers:
- 2008 535i, 320,000km
- 2004 X5 4.4, 01/2004 production, 420,000km
- 1997 328i, 350,000km

Track:
- 1996 328i, track/race car, ~300,000km

Winter:
- 2013 Ski-Doo MXZ X 800 E-TEC, trail can
- 2007 Ski-Doo MXZ Blizzard 800 HO
- 2001 Ski-Doo MXZ 600 w/800 engine, exhaust
- 1978 Ski-Doo Olympique 340 (vintage race sled)
- 1977 Ski-Doo Olympique 340E