I have an Elna 7200, that I was able to buy a specific bobbin case to avoid that problem...see if brother offers such a thing. I have done FM on other machines that don't have that bobbin case and found if you slow down slightly when turning corners or coming to a point that will help as well (that is really just a matter of practising and finding your own timing and really knowing your machine) Also the suggestion about the needle is a very good one, change your needle on a regular basis. I have also had some issues with batiks. Last but not least, be aware of the thread you are using/needle size, make sure your top thread and bobbin thread are well matched because that can cause issues too. Good luck!