I have a Grace Quilting Frame and have been using my Elna Pro Quilter with it. This works well unless I am quilting a king size quilt. When I get 2/3 to 3/4 the way through the quilt, my "bite" gets very short! I work full time outside the home, so don't have a lot of time to sew, so I can't justify spending more than $2000 ish! Any suggestions? Thank for all your help.