I have to correct what I said about print prices. Amazon's announcement of printing cost changes, effective on June 20, differentiates between regular print sizes and large print sizes. Interestingly, 6 X 9, which Amazon always advertised as the norm, is now a large print size. That means a somewhat higher fixed cost and cost per page. It's hard to know exactly how much of the difference the cost per page will cause, as 6 X 9 would have somewhat fewer pages than smaller time sizes.
Amazon is offering a bulk price update for people who want to make the same royalty after the change as they did before. You can find the link to it and a link to the table showing the new print costs near the top of your bookshelf page. Particularly if you have a lot of titles, it would be good to do the bulk update. As KDP says it may take several weeks, and the price change is only a little over a month away, I'd suggest initiating the process now if you're going to.
I selected the bulk update, but I'll see how it turns out. If the prices end up being outrageously high, I'll tinker after the update is finished. I don't sell many paperbacks anyway. They exist mostly as a convenience for my readers. I'll just have to see how it shakes out.