I am trying to use a walking foot. Seems no matter which stitch length I use I get tiny stiches, almost impossible to rip out without ruining the fabric. Does this mean I have the wrong walking foot. I bought it when I bought my machine. I do have a request in to the Brother help line & they suggested thread, needle & bobbin, one of these were not right. So how come when I use my 1/4 inch foot the sewing is right. I even checked with my book, it sewed about 2 inches before it went to the tiny stiches.