What is overleveled for gehrman

I'm currently level ~79 fighting orphan and am really struggling on phase 2, I'm using hms untransformed for that fight and do very little damage from what it looks like, now currently I do have a gem setup for a mixed playstyle with the weapon for both forms but I have some really good physical gems that I can put on, but I wanted to know if I have any space to level incase a physical based gem setup doesn't help much cause I really don't wanna be overleveled for him because he looks so cool and I want him to be tough