Sorry I didn't see your question. I had to go get a new router which is confusing since I know almost nothing about this sort of thing. Anyhoo..I've only done fair isle in the round so I wouldn't have known. Glad you figured it out!
Carol, I don't do every stitch. I only do it about every 3 which seems to work fine. I can see where doing it every stitch would make it stiff.