I've been doing doubleweave scarves. They are quite narrow, approximately five inches wide. 8/2 Tencel for warp, 60/2 silk for weft. My tension is perfect, the fell line is super-straight, my selvages are fine. The weft goes in at the proper angle. I take the scarves off the loom and the selvages lay flat. But after washing and drying I get a curly effect on the edges. What could be causing this? It's highly variable - some scarves are somewhat flat, some have a lot of curl.