I’ve started a sock with a 100% cotton yarn (Sugar and Cream by Lily). I’m doing it top down and I’m 2 or 3 inches into the 2x2 ribbing. And I'm finding that when I stretch out the ribs they stay kind of stretched out instead of snapping back like the wool socks do. Is this going to be a problem? Will they stay up or pool at the tops of my shoes? And what about shrinkage? I’m wondering how many more stitches I should cast on than I would for wool. Any thoughts, advice, or commentary Kind Knittermen?