i haven't personally used this method but do have friends that swear by fleece backings. I've seen it used on toddler quilts but not on larger bed sized. My friends do not use any batting for their projects.
I have used minkee as a backing and over time as it thins, I'm wishing I'd have used a thin batting with it.....however, minkee isn't as thick as the fleece and I'd imagine that quilting it would be difficult with the addition of batting.I'm not sure how helpful this is, but do wish you best of luck with your project.