I have used Hobbs 80/20 and my quilts have crinkled more. (I really like it.) You can get it at a lot of different places(JoAnn Fabrics, Hobby Lobby, Connecting Threads.com). I just wash and dry normally. I also use Heirloom batting 100% cotton from JoAnn Fabrics and it lays a lot flatter.
Love how bright and cheery your first quilt is. Great prints!!