Do you mean make it so Natasha isn't outclassed by moulder? Because natasha comes with 2 magic compared to moulder's 4.
Buff light magic. It's only useful on bishops. Give it a bit more innate crit(10% on shine, 15% on divine, 10% on ivaldi), and make light magic lighter than anima magic.
Buff forde. Not sure what the best way to do it is, but he is normally outmatched by franz by the time he joins.