I can't get my back and batting to stay in place even after pinning on my knees for hours and cutting the backing and batting at least 5 inches bigger than the quilt. The front always runs off of the back when quilting. Still new to quilting and don't know what I am doing wrong. I have 4 quilt tops I am afraid to try to sandwich and quilt! Really can't afford to hire a LA'er to do it for me. I have a walking foot and embroidery foot. Just can't seem to get it quite right!😪