This morning it seems that I was motivated enough to swap around some fuel injectors. 1 <---> 3, and 5 <---> 7.
I drove it around some with this tune:
Attachment 133141
And the first log:
Attachment 133139
The occasional misfires that were seen at Cyl 7 now appear to be at Cyl 5, and a single miss at Cyl 6. What is considered acceptable and what warrants replacing the injector? It has occurred to me that considering that there weren't misses at other cylinders, that that would be enough to warrant replacement, but I'm just speculating.
The vehicle sat for 90 minutes, and here's that log on the same tune:
Attachment 133140
This one was still a really sooty start, but much smoother than in the past. I attribute this to no misses immediately after starting. There are again occasional misses at Cyl 5. Subsequent restarts on this tune were also quite sooty.
I changed this tune by bumping up the Startup Airflow ECT considerably:
Attachment 133138
And the log:
Attachment 133142
Here, as has been mentioned, there are post writing misses upon start. Then there are the now familiar spotty misses at Cyl 5. The restarts were much less sooty.
Then there's a log after just sitting for a few minutes, no tune changes:
Attachment 133143
Note that there are misses at other cylinders, but none at Cyl 5. This observation is the basis for my "acceptable amount" question.