Join the club.I have been quilting for 10 years and stitch-in-the -ditch is hard to keep in the ditch, but lately I found going a slower speed and if you look at the walking foot --see where the foot has a little lip kind of thing sticking out near the needle, run it along the ditch and move your needle so it is level with that lip, sew along the ditch SLOWLY and you should be OK, if your attention is blurred with concentration -STOP.Refresh your position, go for a drink or some thing else, then start again. Remember to leave your needle down so it won't walk on you when yo start again. I had only one mistake in a long run -my fault. this works when you are sewing white on white, with dark colors etc. Give it a go and see if it works for you.