I love this scarf and recently made it in Debbie Bliss Cotton Angora. It did twist and spiral like mad. But when I made a second one with King Cole Merino wool, it turned out fine: no twisting or spiralling. Maybe the yarn plays a part?
Here's a link to the merino scarf: http://craftybernie.blogspot.com/2006/10/ise-iii-finished-yay-me.html