theducks, thanks! But that's exactly my problem: I cannot fill the viewing area all the time. It's great that it is allowed, but the end result is different. Sometimes it works, sometimes not. There is about a 50/50 hit/miss score so far (after about 500 books done). What intrigues me is what I indicated before: when I hit the READ button at the top of the CC screen sometimes there is a quick vague glimpse of the complete cover in M+RP before it goes back to a smaller one.
Greatly appreciate all you guys' thinking along and offering ideas. Very intriguing stuff!