Carl commented:
Good luck, David, with untangling this.
Yes this thread has gone in so many directions I fear untangling it is impractical. To date I have only seen one point that deserves a separate thread, so may create that one day.

When a thread does this I prefer to copy posts to older appropriate threads.

Meantime my mother-in-law duties are calling, so off to support her. She rarely needs defending.