How to stop frame drops during Boss fights in No Rest for the Wicked?

I remember facing a powerful Boss; as they unleashed a massive attack, the game stuttered. I was actually excited to try some extreme tuning to fix this thermal throttling. I tried switching the system to 'Balanced' power mode; temperature dropped by 2℃ per AIDA64, but the minimum FPS plummeted further per RTSS. I used the GamePP Fan Curve Configuration Panel to trigger max fan speed at 65℃ and set the response time to 'Extreme'. RTSS showed frame times converged from 18-45ms to 12-19ms, with CPU temperature stabilizing at 74-80℃ per AIDA64.