You are right on, Carrie! Using superwash wool won't give you the tighter weave structure in the stripes that you usually want in a blanket. It won't pull together at the fold if you use superwash there and give you a nice finished look. It would be worth your investment of time in weaving the blanket, to put on a small warp that combines the two in a scarf, using stripes the width you plan for the blanket. Full it the same way you would a blanket and see what happens.