Im ok with Clarity taking an Ore, Im ok with G.Might/G.Shield taking an ore. (Make VR take an ore plz =P)
Im iffy about Major Heal. Thats a spell that can be used very often, way more then 1 per person per 20 mins. Its costing Bishops & EE's alot to be able to use their best Heals.
Erase is fine, something that powerful should cost something.
Turn Undead im not sure of, I dont use it for PvE (Undead Nuking) because it takes alot and doesnt garentee a Lethal Strike, and with the Cast Speed on MoH (A Narturally faster casting Nuke, plus an EE's cast speed) its easier to just use that to kill before you get killed.
I don't care about the cost of spirit ore I burn on Major Heals. I am more than compensated by being able to spend the extra MP on extra spoils and/or extra mass-stuns. And I always can delevel to compensate for extra XP, too :p
I am puzzled by one thing; the Greater Might/Shield buffs don't seem to overwrite the Might/Shield buffs; both 'sets' still appear on your list of active buffs in top left of the screen. I have not taken the time to see if they actually do stack in the stats tho (too busy killing and spoiling/sweeping.)
Oh, another thing, if weight is a problem, have your party's dwarf or orc carry the spirit ores. And... since I'm getting the buff, I supply the ore (unless I forget.)