It took me almost a year to find the perfect combo of brand of thread, needle size, bobbin thread, and tension setting for the machine I use for fmq. I don't change it! LOL. I use Glide thread, Superior's Organ titanium topstitch needle size 80/12 and Glide Delights prefilled magna bobbins with a Bobbin Genie. If I use different thread then I have to go through a process of testing needles and tension.
http://www.bobbincentral.com/
http://www.superiorthreads.com/produ...chine-needles/