I seem to be having trouble with my sewing machine when I try to FMQ. It looks like I am moving too quickly because I can see the loops on the backside of the quilt. I meander almost all of my quilts and I can't figure out what I'm doing wrong. I do not adjust my bobbin tension, was told to never do that. It is due to be serviced, but I have 8 more quilts to finish before Christmas and swaps that I'm in. I have tried slowing down when quilting and also adjusting the speed of my machine and nothing seems to work well. I have also cleaned out the bobbin area, put in a new needle, oiled. Is there something I'm forgetting? It sews perfectly fine other than the FMQ. Thank you in advance for any advice you have.
Edit: Because of cost I have been using polyester batting on this quilt and the previous couple. I usually use warm and natural or a cotton blend. I find this polyester batting to be a real pain to work with.