Leah Day (an awesome FM quilter) says to FMQ with your feed dogs up and the stitch length at 0. She feels the gearing on machines changes when the feed dogs are dropped. Try her idea. She also says using the Genie Magic Bobin Washers is helpful.

Are you using the cover plate with the straight stitch little hole or a zig-zag cover plate with the wide hole? My machines must have the little hole plate or the plate that covers the feed dogs.

My machine was doing the same thing when I used monfilament poly thread on the top. It's fine when I use the same thread top and bottom.

I just looked closely (I was afraid to earlier) and the loops are coming from the top to the backing. Would the Bobbin Washers help that? I'm willing to try anything and I'm starting a shop hop tomorrow so I may be able to find them.

I have the same thread top and bottom.

I'm sure getting my exercise jumping up and going to my sewing room to check all these things.

I have the zig-zag cover plate on. When I get brave again I will switch it and try again.

I did read this here on the board a while ago and I did leave the feed dogs up. It definitely works better so I believe she is right. I think I will have to find those washers.

It looks like the loops are on curves. If this is the case, you need to slow down on the curves. Don't slow down the machine speed, slow down your hand movement.

When I first started to do free motion quilting it was really hard for me to keep the speed of the machine consistent. The more I concentrated on the moving of the quilt that old foot would go to the metal. I think it just takes a lot of time to get the speed of machine going smoothly and moving of the fabric will follow. You might need to just keep practicing. You can fill up a practice sandwich, then change the color of thread on the top and go over it again, that way you can see if you are improving on that pass.
On of the big problems I had at first was also I would forget to put my presser foot down before I started.

If your problem is on the bottom, check your tension on the top and vice-versa. Always look in the opposite direction of the problem. If you are moving too fast, generally it will show up as a broken thread or needle. The little washers are great but the metallic needles are a gift from heaven.