I have a Janome 6600p that I'm using on a Grace start right quilting frame for the first time. When I start free motion quilting, I'm get bird nest and extremely loose threads on the bottom. The top thread is also breaking despite whatever tension I used. I'm also using the special bobbin case for free motion quilting that is suppose to stop the bird nests. My tension is set between 5 and 8. I wanted to know if I should invest in a stitch length requlator which run $500 or is it something I'm doing wrong.