I have a Janome 6300, which I really love a lot. It is a real workhorse of a machine and simple to use. My one issue is that I keep breaking or shredding the thread. The tension is on about a 4, and I use pretty good threads: usually the Coats and Clark Quilting thread, or All Purpose, sometimes the Gutenberg thread. Does anyone have this machine and can recommend what kind of threads work best? Thanks!! I find this so frustrating, to be sewing along, and then see that I haven't sewn a darn thing in 12 inches!