Found a big part of the problem with my early 2009 macPro issues. Apparently my recovery partition got corrupted by a High Sierra beta I tried briefly in June I think. I had restored the drive, but that did not scrub the bad recovery Partition. And since its near impossible now to find a copy of the original Install Sierra package now that official High Sierra has been released, I could not fix/restore the recovery partition. But last night, on a hunch, I checked a developers' site and found a hidden page with Sierra tools and a link to the Sierra install package, and that was all I needed to repair the partition on my OWC SSD as well as on the original Macintosh HD HDD (which had an El Capitan recovery partition) I had pulled last spring when I installed the SSD. So now, the recovery partition is fixed and has Sierra on both drives, both drives have been Time Machine restored to 10.12.6 of Monday afternoon, and after work today, I should be able to do the upgrade to HS!
(My OWC SSD is their 480GB Mercury Electra 6G 2.5-inch 7mm SATA 6.0Gb/s SSD and not the Aura
SSD.)