Voltage.
You may get better performance simply letting the CPU boost itself. The best bit you can actually help is fine tuning your voltage.
You don't need to be too aggressive with voltages, though.
A simple -0.1 offset would shave 10C under load here. -0.2 would shave more than 16C, but from -0.1 to -0.2 you may find points where stability is compromised, or performance is compromised (the chip may be cool enough to boost higher, but the voltage available isn't there).
And there's no magic recipe. Some CPUs would perform best with PBO on, while others won't All you can do is spend few hours testing.
The initial step would be PBO on and off.
Check temperatures.
Likely to be high temperatures with PBO on.
Them set an offset voltage, starting light, let's say -0.05, -0.1.
Temperatures spikes for Ryzen may be scary, but during gaming shouldn't stay constantly at 80C. I believe your current CPU isn't able/allowed to downclock when needed/possible, what causes the high temperatures you're seeing.
Unless you use your CPU for tasks where an all-core OC is better, the flexibility of boosting only when is required would give you better performance and better temperatures.
The 3600 is a 6C 12T CPU, and even the poor optimized BFV would require all it's cores to be at 4.2 to allow your GPU to perform.
My sig here, the 3090 would run out of gas before my 12 cores do, unless I force a scenario where the CPU would bottleneck the system (1080p low res).
Previous experience from other users here is that even 3080/3090 GPUs would be fine with their 3600/3700. A newer/faster CPU (or an OC in your case) may allow single digit performance gain, but unless your CPU is constantly at 100% and your GPU isn't, no point overclocking your CPU.
