I don't think morale 30 is immune to fear. They can rout IIRC, but don't trust me on this. 30 is just a way of saying 'practically unroutable'.
I'm starting to think that you should not trust what I'm saying, so I'll say some more to confuse matters further
- Moral loss might have replaced the fear bonus
- Morale loss (and gain from standards) gets halved each round.
- Morale regain will only affect those not in melee.
Neither of these comes from trusted sources, they come from me.
JK is on vacation playing golf or something, so he can't shed light on matters