So sorry for all your troubles. I also have a 7700 and had some issues with it. The shop where I bought my machine was very helpful and walked me through them. The biggest thing was the speed. This machine goes so fast, so turn the speed down to where you are comfortable with it. Needle........I changed to a Janome needle for quilting/embroidery and that also helped. Then the tension needs to be on "7" instead of auto. Also, he had me turn my stitch down to .02, just during free motion. I hope this helps!! Merry Christmas!