So do have start the game again from the beginning? From what can see in the image Ashley has a normal size, she is the one I am interested in, the others look good with big breasts But Ashley does notif you mean, how to make them "Big" but not extremely big, then you need to feed the girls non fatty food and not encourage them to grow bigger.
still, that ending doesn't have "normal" sizes, all are big, just that some are massive while others huge.