Spotshooter,
Thanks very much!
Darned if I can remember where I first mentioned over-tightening scope rings, but it was at least 15 years ago, and in more than one magazine article and book. Which is probably why you can't remember where you first read it!
Do know the chapter on scope-mounting in my 2010 book Obsessions of a Rifle Loony starts with over-tightening.