Siiiiiiigh!
When the batter is crowding and F2 moves to the inside, the reason you move up is to gain a view of the slot. the reason you move back it to open the field of vision so the pitch doesn't "explode" on you. You will
not be able to track the ball to the mitt because F2 has cut you off. That is not a problem because you moved up in the stance (vertically) and that allows you to see the ball crossing through the strike zone but you
will loose the last few inches of the pitch.
if anyone wishes to argue this point, I suggest you find the grave of the Late John McSherry and argue with him on this. Better yet, watch his video and learn a few things.
Behind the Plate With John McSherry
You never,
never cross to the side opposite the batter. You do not get a proper view of the pitch and it is dangerous to your well being.