See you found a solution but I’m still curious how you had this problem. There were very few enemies that I felt had a health pool wildly too large and it was usually as a result of the enemy upscaling feature rather than death March. Those two enemies begin the Djinn and a certain swordsman fight from the DLC.
I had to consistently play with upscaling on because the enemies were generally too squishy and I was killing them so fast the challenge of death March was wasn’t completely unnoticeable.
I wonder if it was your build or perhaps some other aspect of your gameplay that made this happen?