Oh, you're just getting started...
I'm almost done with NG+. I'm at the second to last boss and it's absolutely kicking my arse. How are you building your toon? I went straight Motivity for the first play through, and now I'm running a bit more balanced.
Big sword and motivity. I'm using one of the boss weapons that I can't remember the name of. I'm in the opera building now and still haven't really struggled with any bosses. The black rabbit brotherhood fight took me a few tries to master the timing of the blocking.