I’m so pleased to report that Roon ROCK and my entire Roon experience is far better, so thank you for your guidance. My NUC is only a slight bit warm and Roon has been playing remarkably well.
The only legacy problem the persists is what I linked to in post #7 on April 5 (and linked here). I would love to have a fresh look at that item, but for now, this issue can be closed out.
David