Count me as another vote for AM until 12 then switch to PM wraith.
But you now have to slot in nullification and likely void lore, since aura-healing is where lore really shines, which offsets those two slots you saved.
(Zombie form is the opposite of axeblock: zombie is dr/slashing, while axeblock is dr/piercing,bludgeoning. Since I normally wear mire set anyway, zombie would only offer me dr vs bludgeoning.)