I currently have a quilt on my frame and working on FMQ. The top is looking GREAT. BUt some of the back is not looking so good. some places the stitches are perfect and some look just like a plan line and not stitches. What is causing this? I have slowed my speed down, which has helped with my thread breaking. The top is great, bottom not so great lol. any input would be nice.
Wendy

sounds like you need to increase your top tension

Yes, either tighten the upper tension or loosen the bobbin tension. I prefer to work with my tensions as loose as possible, so I'd probably loosen the bobbin tension first. Of course I say that without having any idea of how tight your upper tension is to begin with, LOL