Perfect! Now just below that layer add a white "Solid Color" layer, then invert its mask, then carefully paint it on over the overhanging parts of the photos.
No, the black on white one is fine.
Can you move that layer to the very top of the layer pile, then change its blend mode from "Normal" to "Multiply" then show me another screenshot?
When you first lower your screen's brightness to where it correctly matches the prints, you're likely to HATE it. But I promise, within a week you'll be wondering how you ever tolerated it so bright before.
No, sorry
While you're waiting for the calibrator to arrive, can you at least compare your screen to prints, and turn its brightness down to match them?