A proud man would STFU about this, but...
The shims are fine, I think. The lug nuts were loose. I mean loose enough that one flew off last night as we got to our destination, 50 miles from home. I recovered it, and the original lug wrench did the job of putting them back to right. The original jack, of course, was dead (timely thread on here!).
After getting them on tight, we drove 5 miles, stopped and re-checked them. The truck perfectly drove smooth up to 70mph.
BTW, she passed the MD emissions test. All that's left is little stuff and getting a welder on that frame.
(and of course, apologies for thread drift)