Thanks Prism, I think I will try your method. I may have been paying attention to the wrong things.
"I wonder if you are understanding how that V comes about. Getting the fold even with the selvedges has nothing to do with it. The angle of the ruler in relation to the fold is what determines that V. If the ruler is at an exact 90-degree angle to the fold, you will not get a V. If the angle of the ruler is off by 2 degrees or more, you will have a V."