I use the 1/4" foot and these sewing edges. They're great and only about $5.
http://shop.online-quilting.com/shop...&category_id=2 I don't depend on anything other than a ruler when I place these. Just measure 1/4" out from your needle and then lay down the strip. They're reusable and if they begin to slide around and not stay in place just clean them off with alcohol. Even with both of these I still have to "fudge" sometimes but that's all part of it. I sure do feel your pain.