In regards to the second part, FullHeal is intended to be affected by the self healing nerf. Clerics are "under-powered" if you pit them against the samurai, because they're a healing class...I can confirm that Chant heals for 350HP in game as a Cleric. I can also confirm that FullHeal heals fully as a Cleric as well.
Isn't FullHeal healing 100% by design though? If that got nerfed Cleric might, dare I say, become under-powered... especially against a Samurai's MortalWound.