I use no pill plush fleece on the back of a lot of my quilts - love the feel of it and the weight is the same as a quilt with batting in and a regular cotton on the back. A quite thin fleece would probably need something between. I machine quilt on my domestic machine and it slides so nice when quilting. I have never put minky on the back of a quilt without some kind of batting as it is a thinner fabric. Do a sample block with and without something between to see how you like it.