Hi, you just need to run the benchmark to see what settings will work great.
Sounds the settings you use max out something almost completely at some point.
You can also use the ingame FPS limiter if you want higher grafics and lower FPS.
If you ran the benchmark, check what the lowest FPS is and put a the FPS limiter on that if you want to keep current grafics settings and otherwise change grafics settings untill you have the lowest desired FPS.
You can always use the FPS limiter to stop frame drops,...
I play with 45 FPS max and ultimate grafics settings, never FPS drops and smooth as butter. Just when playing competitive it might be needed to have higehr FPS. You need to figure out what
you need and like more for yourself.
Is it console or PC?
I've been running the game on PC (FX 8320 / RTX2070 / 16GB RAM) and I had many FPS drops in rooms or when fighting enemies - and the most of drops when both were occurring, but since I've changed FX8320 to Ryzen 5 3600X I have constant 60FPS all the time (V-sync on since my screen is 60Hz only while I'm playing 2560x1440 with Ultra Details on Vulcan - with DX I get barely 30-35FPS all the time with the same settings).
Cheers!