The fix for this was a new PCM. The alternator B+ was floating between 12v and 13v while the engine was running, yet the key on engine off scan data for system voltage was 15v. I had already checked the PCM system grounds, so I felt comfortable with replacing the PCM.
Now..... if I had poor PCM grounds, this should decrease the total potential seen by the PCM with the key on engine off. That would mean LESS than battery voltage. So, the way I see it, unless that potential was low enough to cause the PCMs logic circuits to go nuts, there had to be an error in the PCMs voltage sensing circuit(s).
And lets not forget the irratic trans shift....