I don't understand something. When FMQ, the main problem is tension, right? So why wouldn't I use the same exact thread (heavier weight/vareigated, etc.) in the bobbin to help make tension more "the same." Also I want the back to look just as pronounced as the front -- why not? I like the quilting to pop (though I'm a newbie to FMQ) so I'm planning to use 28 weight variegated cotton. Is that too thick for the bobbin or something?