Jawge, that might even be enough to get me out of my predicament. I think pretwisting (in the wrong direction) has been my downfall. I wondered why I would sometimes not have the problem, it is probably when I got lazy and didn't pretwist the two bundles as much.
This will still not make me want to make strings, and I'll probably use the timber hitch for a lot of my homemade bows. But it does fill in a gap in my archery knowledge. Thanks to you all.