I have 1 15. I purchased it to do quilting and FMQ. I also have an original grace frame that I had my 1970's Kenmore on. But it just isn't very fond of FMQ on the frame. So I have taken it off. I am up for suggestions for what to put on the frame that would have a larger throat space and would be good with FMQ. Should I just get another 15-91?