I had two holes at 120 and 100 and the car ran fine on the road, idle was rough only when burning cetane 40. If I put in 45 ran great. My low compression was causing fuel smoke, but not black. It was more like a stinky whitish grey, mixed in with some blue (cause the valve guides were real sloppy). So I don't think even one hole at zero (bgkast had a tight valve and got a reading of nada on one cylinder) would produce black smoke. Obviously, you should adjust valves and check again, but like suggested, you have a different problem. What kind of mileage did you get on your roadtrip? It sounds like the IP is pumping fuel in that can't be burned. Maybe check your ALDA. I'd do a search on "black smoke" and see what you turn up. Good luck.

BTW, I've driven that stretch of road around the Bay, and I was the one cringing. Yikes!

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1998 E300D, 287k, barely broken in.