Can I make an odd suggestion? Try stitching in the ditch fmq. I always do mine that way and I think it has helped me to learn to control my speed and the quilt. Maybe if you are doing a movement that you are already comfortable with it will help. You are used to the speed that your hands are moving for that machine speed and the sound that goes along with it. If you are still having breakage problems you will at least have taken your movement and speed out of the equation.