I took out one repeat from the repeat section and reduced it down to 3 instead of 4.
It is definitely weaving up more square, like it should be!
I'm not sure if I have enough pink to do anything more than a perfect square piece, but I know that there will be enough warp left for possibly one or two more longer runners (it IS only a 4 yard warp...) so I think I have enough time to experiment a little bit more. If I feel like I want more, I can always tie on another warp.
PS. The bending and U-shape in the above photo is not the weaving, it's the wide-angle camera this time!