Glad you figured it out! I ADORE mine too (had it since mid January) and it has made quilting fun. I have yet to adjust my tension for anything and I've used several different brands of thread with no problems at all. I even love oiling it.
If I could only find a way to make sandwiching tops fun I would just quilt all the time! It's also great for machine sewn bindings, it handles the bulk with ease.
Have fun!