"Move up in the box", eh?
If that's what coaches are telling their players---meaning the batters---to move up in the box, there's a way of dealing with it. Don't give them anything they can hit! My wise and wonderful pitching coach, Eddie Lopat, once told me that the way to discourage a plate-crowder is to pitch him in on the fists, jam him, move him back from the edge. Don't throw him a fastball, because that's what he's looking for---try a knuckle-curve, for example. That's a pitch that comes in there looking like a fastball and then suddenly drops like a glass hitting the floor and shattering into little tiny bits! I used to do that with my slider and ended up striking them out.