Go to Day Style Designs Online, and contact Leah Day. She will help you to know what to do. She is an angel with helping problems with free motion quilting. You can call her too. Believe me. She will know the exact answer to your problem. I have the same 6600, and I found that if I go to fast, I get what you are talking about. Please, contact Leah. You will be so glad that you did.