Ok maybe I'm just gimped.
On Lightningsday, with Rairin Obi on a Tier III and IV I actually did LESS DMG then with Penitent. I tried a tier II and with the Obi, hit for 47 MORE DMG. However, anything higher, III AGAIII IV Tier spells, I hit for about 50 less.
I tried this a lot and it happened constantly, these were not resists. Anyone have something similar happen? This doesn't make any sense.