Good news! My last two side borders fit perfectly! And I figured I probably could re-press that one short border and 'coax' a little more length out of it. There's a lot of bias movement in those borders, the way they are cut and set. Really helps with fitting! So I took the one short border off, removed the spacers, and pressed it well. Then it fit! So all 4 borders fit without spacers needed anywhere. Whew! I've never done a border like this before and I learned a lot. It was a great project. After quilting, the binding will be another dark red like the small stop border.
I tried and tried to post pics for you, but the site is not uploading them. I reduced their size to 1.19mb, which is plenty small enough, but they still won't upload. Phooey. Will try again later.