I use my dual feed to do walking foot quilting on my Elna. It recently was skipping stitches and varied the length of stitches on a small sampler. I found that lengthening the stitch length slightly and using a smaller needle (which seemed counter-intuitive to me) made it all go a lot more smoothly and evenly. I have a larger harp so usually don't roll my quilts up to quilt but rather let the puddle in my lap, on the sides, and up the wall (or window) behind the quilt. Works for me.