I have seen a different video where somebody showed using decorative stitching for quilting, and she stressed the importance of testing out various stitches on a test piece (front, batting and back) before doing it on your quilt. She had test pieces about 14" square and would make a pass straight across, and then note down the exact setting with a permanent marker by the pass. She could get quite a few test passes on each square. She would play with the +/- setting on the machine to get the stitch looking good. Then, when she was ready to work on a quilt, she could look through her test pieces and see how the stitch would look and what settings to get that exact look.