Hi. There is some very impressive troubleshooting going on here. Bravo. What beautiful batch files from Matthew Wai and einstein1969.

I've got a long history which doesn't necessarily translate to...

Agree somewhat. Of course describing a clean boot wouldn't require 30 lines. And a clean boot only gives you binary information.
No, it's gradations of clean, layers to isolate. But you know that...

I've had similar symptoms, many time over the years. I currently have Windows 10 on an SDD.
Here's how I isolate these slow boot issues:
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Win-R Run msconfig > General >...

Exclude BOTH of these paths
Exclude Folder = C:\Windows\System32\drivers\etc
Exclude File = C:\Windows\System32\drivers\etc\hosts
Works for me. (I send facebook and twitter to 127.0.0.1)
Note 1:...