Can 5600x hit locked 60 in P5?

Playing the game now with 4k scaling custom build for the rexis mod, and it can't quite hit locked 60 in areas like backstreets, school hallway, central street etc. I see that not all 5600x threads are maxed out but not sure what I can do to squeeze a out a bit more performance out of it and keep 60 in these areas. The current settings are: 

PPU decoder - Recompiler LLVM
SPU decoder - Recompiler LLVM
Enable SPU loop detection
SPU Cache
SPU Loop detection
Thread scheduler is off (had 10 fps less when it was enabled)
Block Size - Safe
Preferred SPU Threads - 2
Vulkan
Resolution Scale 400%
Async (multi-threaded)

Is there anything else I can do? Would an overclock help?