And hits like a trunk too. It likely is as you said, an OP build that doesn't scale well. So to beat him (I really need to not nerf my own armor before complaining), there has to be a bit of luck not for him to get a visceral or get him into some pattern where he doesn't do it. It could also be my use of BoM that has him going crazy with gunshots, tele, and viscerals. Yet, I'd rather not change weapons or cheese him.
Regardless, he isn't the only imbalanced enemy but probably the worst. The assholes pictured below take 90% health off in NG++ on a standard attack. I'm using slightly nerfed armor (as stated) but that's a harder hit then the bosses! Large huntsman can also take off near 80%. I cheesed out Abhorrent Beast (doorway trick mostly) cause I have already beaten him multiple times in the dungeons and I can't stand falling off that roof. But if some people saw how hard he hit and how much health he has in NG++...oh boy.