I've had more issues with my machine skipping stitches while FMQing 'backwards'. Other than the skipped stitches, I'm delighted with my quilting on this one.
Although it's definitely not the whole problem, it seems it really doesn't like 40wt thread, even the gorgeous King Tut stuff, so I might have to investigate some 50wt thread options. Any suggestions? It needs to be good quality and have a good range, and the variegated threads needs to change colour every inch or so, not every 3-4 inches.