Rod Carew changed stances and position in the box as well as changed bats based on the pitcherI do not teach my students to move around in the box, from pitcher to pitcher. We measure across the plate, with their bat and that is where their front foot goes. (The bat is on the ground.)
We don't change bats, choke up or anything else. Wouldn't MLB players look ridiculous moving around, up and back, towards the plate, and changing bats? Just teach the girls to hit.
My pitchers love to hear a coach yell, "Scoot back in the box." They might as well yell "because I know you can't hit."