Paladin's 20000 DEF: Does it work?

I think my W.DEF should total to like 13k (it was somewhere around 11k before the Shield Mastery buff in RED), and I take (almost?) the same damage with and without charges, with and without Iron Body/Parashock Guard. That's why I'm thinking it doesn't work. But I do seem to take slightly less damage than pre-RED, even though I no longer have Power Guard.

I'm asking because I might put a point in Hyper W.DEF (rather than Hyper DEX) if it works but maybe that's not a very good idea anyway.