I think I've finally found a way to sew selvage edge's.
When I first started sewing and saving selvage edge's, I only cut off the edge, not any of the fabric.
I've since learned you have to take some of the fabric as well.
I've sewed them onto a paper block and went from there adding more edges.
I have to say, I'm quite pleased with the results.
I made 6 5" x 5" blocks in no time.