Leveling Difficulty Changes Incoming i would presonally rule this one out as it seems like the leveling change and the numbers not being full damage seems wholy unrelated.
I also checked for you and touch of death is physical damage and did some testing and i have the same on only my physical damage classes so may i ask what other classes those were. And as for timewalking that wouldnt have anything to do with it or you wouldnt have a lower amount of damage done opposed to what the tooltip says