I find the easiest way to avoid V shapes in my strips or pieces is to use my large square to rotary cut against. When cutting with a regular ruler it is all to easy to shift the end one way or the other along the fold, that is what makes the V. I am going to try and show a picture of my 15 inch square on a piece of fabric ready to cut. My 15 inch square lets me lay it over regular twice folded 11 inch fabric (44in.)