I found a tutorial online for my Pfaff. Well, I viewed the tutorial for my machine and learned WAY more that what was presented when I had my "free class". I have been using the incorrect foot for my free motion attempts which might solve my problem. The correct foot is only $16. For that, I can invest and try again. My fingers are crossed and a pile of quilt sandwiches are waiting. .
I searched for a similar tutorial for your machine. It might help you solve you problem with the thread breaking. I just did a Google search with your machine numbers and up popped several options. I like the one from Village Sewing.
Hope you can find the solution to the breaking thread problem. Chin up and quilt on.