I'm new to FMQ. When I first started, I did pretty well on my Singer Featherweight. However, the last few times I've tried, I get several inches of skipped stitches. In fact, it is mostly skipped stitches and a few regular stitches. I'm very frustrated. I've tried larger needles, changing bobbin, tensions, etc. Please provide any advice you can or I'll be limited to stitch in the ditch forever! Thanks!