Something is wrong with either descriptions of abilities or damage calculation for spell FF. I have 3 magic items providing 10% magic res each, 23% ward save and selfish perk which is supposedly reduces FF damage on myself by 90% and with all that I still pretty much hit myself for full damage.

Bonus meme: chillwind always hits me while I'm on horseback, possibly 20% aoe career perk for spellsingers has something to do with it.