Abuse your regen. Try to keep regen on tanks at all times. If you see random dps taking hits, toss a regen on them instead of a cure II/I. Try to cure I as much as possible, I would say if a tank is under half HP than you want to cure II. I normally try to line my cure I up with the boss's auto attacks, basically casting it on cooldown. Prevents you from blowing mp on a cure II when not necessary. Let your medica II regen do its job. I see many whm's medica II, then medica to top people off. Let the regen do that, otherwise you're overcuring by alot.