I am doing a Judy Niemeyer paper pieced pattern at the moment on my Janome 7700 and am using a open toe accufeed walking foot. I have the stitch length set at 1.50 which is what is recommended on the pattern and am also using batik fabric. The fabric does look just a little wrinked when I have sewn it (possible because of the smaller stitch length) but I press on top of the seam first with a dry iron which gets the wrinkles out. I then flip the fabric open and press again.