Thank you Mystafo, I was nervous to do this as I didn't want the cover to hold while insides shifted about as you mention. After reading numerous agreements with this method on another recently discovered thread, I meekly attempted to tap the book into a more aesthetically pleasing position. I finally found that appropriate amount of force to very gradually slide the book and I'm calling it a win. If this were an older book or perhaps even just more expensive I don't think I would have gambled at all.
I wonder, for books that are crooked that have a wedge inside, could they be damaged or the wedge become poorly positioned if this method is attempted?