I have this combination one of the reasons my needles break is when I go mad in swirls and circles and go around too fast . This quick movement bends my needle and then it snaps. Try going slower on the swirls. Oh I have also tried a tip from here and tried with my feet up. It works it seems to slow the fabric down ven if you try. Moving it too fast.
Sorry no answer as to what todo to the machine but this is the only reason mine have broken.