I was just looking again at the wonderful Elephant quilt made by irishphoenix, and read her comment about the difficulty she had moving it around for the close quilting due to having used Minky on the back.
I just wanted to let you know that I have learned a couple things from using fleece and other soft backings. One is that it's much easier to have your quilting further apart rather than closer. The other is that if you have areas that you want to do more complex quilting, place a sheet of waxed paper under the backing This allows you to move the quilt around much more easily. You do, however, have to remove the paper after you have finished.
I find removing the paper much easier than unstitching a bunch of puckers and pleats, .