There may be several variables to look at when you are doing FMQ. Thread, Needle (14 at leat or a 16). Use a single hole needle plate and have the feed dogs down. Don't mess with the tension on the bobbin case. That is why you bought it and it just takes a VERY small adjustment to ruin it. Practice on a test piece the same as wht you are going to quilt. Start with the auto or 4 tension. Be sure the presser foot is up when you thread it and you get the thread in the take-up lever. Be sure the thread is in the tension in the bobbin case also. Our customers love that combination and are have great success with their Janome machines for FMQ. Hopefully you have been oiling the bobbin case race and had you dealer clean it for you. Hope this helps as I love all my Janome machines and like it when others do too.