I decided to start weaving over again with a smoother fiber, after all the difficulties I had last time.
I screwed up the warping again (by screwing up my S- and Z-twist), but the actual weaving is going much smoother. This setup is actually giving me half of the pattern on the front of the band and half on the back, so I’m just going to try flipping half my cards around to change the direction and seeing if that helps any.