Hi, I'm a beginning knitter.....still. I made a beautiful scarf with 2 Art Fibers yarns, Fat Cat and Baccarat. I knit it lengthwise on size 35 needles and did the bind off on size 50 needles to avoid a puckered edge. Unfortunately, that edge is so much tighter than my CO edge that the scarf pulls in. Now I'd love to knit Garns Drops Design lengthwise scarf with 6 colors of Manos del Uruguay wool. How can I avoid this problem? BO using two size 35 needles? It's such beautiful, expensive yarn I'd love some tips.