We always pitched from 40 feet, with a 12 inch ball. I don't know who changed it, but I have said all along, that it didn't help the game.
Once a pitcher releases the ball at 35 feet she is then, aaprox. 30 feet from home plate. Put a batter in the front of the box and she is 25 feet from a batter. Try pitching from 35 feet, I think that you would hold back, too.