I know I've been *****ing about it forever but after 2 more corrupted dungeons I've come to a conclusion that they are broken as hell. No regular mortal can clear the boss without dying a dozen times. The bosses don't even have mods, only elemental resist and chaos resist. But their cast speed or movement speed or the damage of spells is beyond the most dreadful nightmare. It was worth to waste pretty much one level worth of exp at lvl 50 since I have 3 pieces of the map for Queen Atziri, all 3 identical but I am sure I can exchange the other 2 easily.
On Normal these dungeons were reasonable, they weren't hard but were challenging enough that if you didn't pay attention, you would die. Then when I hit Cruel the difficulty went through the roof into deep space.
I've also increased my health by 1/3, elementla resistances almost capped but I still got killed instantly, before your brain can even process the information.