It's been a long haul, but I got her back on the road last evening.  Here's a summary of my findings, with no definitive root cause as yet.  I tried all the testing on the wiring.  Finally found that the plug wasn't firing.  And, SURPRISE, the next time I tried it the plug WAS firing!  I got the wiring harness from Sakara and was gonna try that, but it wasn't necessary.  Last weekend I discovered that the main wire bundle, rear of where the headlight wiring branches off, had an issue:  While the bike was running, when I pulled it forward or pushed it in under the tank, the bike would die.  I think I had routed it wrong at some point in the past.  Re-routing it with plenty of slack, and on top of the tank support "ears", fixed the problem.  I rode to work today with everything working just right.  

Thanks for the help.  Just wanted to bring the thing full circle to a conclusion.