WHM has maim and mend and freecure. Use shroud whenever mp is at 60% or less. If you just spam cure 1, I don't see how you'll ever run out of mp. Even in coil, if you used all the arsenals a WHM has such as divine seal, you'll never run into mana problem. Divine Seal + Medica 2 pretty much heals the entire party to full health. Regen is the best healing spell per mana. Just slap that onto a dps who can't dodge. So far, I only run into mp problem during the last 25% of turn 2 of coil where I had to spam cure 2 to keep the tanks up. It would be awesome if they'd let divine seal have a 30 sec duration instead of 15 sec. I think WHM and SCH are very balanced the way they are unlike PLD and WAR.