I think pitch comes into play when you have a larger chest,or are a women.I am a larger guy and have a bigger chest.When my stocks are cut at 90 degree's i shoot higher.That is because the heal of the butt is resting more on my chest that the top of the butt.This makes the top of the butt move in a little with the recoil.making me shoot a little higher.I like to cut my stocks at about a 7 degree angle to the rib line.(the line straight across the top of the gun that is level with the rib,from end of barrel to the butt.)This lets the butt rest evenly in my shoulder.I then dont have the problem of shooting high.