I feel incredibly foolish asking this, but I'm having a problem getting a clean unfold on the outer section of the pedestal for my current project. I'm always getting a little stretching on it, and in a perfect world I'd like it to unfold as straight as possible, but it always wants to form a smile. I've been playing with the idea of putting another seam in it to give it two equal pieces. Any help would be great. The part in question is the outer edge of the base.