I have had trouble with the tension while FMQ on my Bernina. Things I have tried: l loosen top tension to about 3.5, on my 430 I pulled the thread through the "little metal thing" next to my spool. I also put the thread through the hole that is on the hook thing that is on the bobbin case that is used for embroidary. All of those things helped, however the my 820 is so different, that the only thing I needed to do was take the tension to 3.5. I am not familiar with the 700 series. My advise is to try the top tension first, and see if that helps.