The best way to avoid poor stitches on the back is to make a sandwich and sew a bit on it before starting on your quilt. If stitches aren't to your liking, you can then sew while adjusting your tension until it is right. Then start quilting and check for a while to make sure the stitches are still right. Try to get in the habit of making sure your backing and batting is not under where you are quilting.
I know, so much to remember but it saves time in the long run. I love a large stipple and mostly what I do. I haven't seen a quilt yet that wouldn't look great with stipples.