The Soft & Crafty batting (48" wide) available at JoAnn Fabrics is 4 oz and it works great for quilts although I do not buy it anymore since the price has almost doubled. Many of the quilts we quilt are flannel, both pieced top and back, and it works well on the longarm. So one ounce more should not make that much of a difference. We rarely quilt small quilts on a DSM but we use a 4 oz batting if we have it. We are quilting quilts for a nonprofit and have become scroungers for batting and purchase batting at thrift stores and rummage sales for the small quilts (we have approximately 100 crib/small tops to be quilted. We use Soft & Brite or Hobbs 80/20 for the larger quilts.