The Witcher 3 keeps crashing in complex areas with my V360 MIST due to temp spikes. Help me!

I was just walking through the streets of Novigrad when the game would randomly crash to desktop without any error message. It turns out the Valkyrie V360 MIST pump in auto mode was fluctuating between 1800 and 2400 RPM, causing the CPU core temps to jump 15℃ in a single second, which triggered the motherboard's instant overheat protection. I tried lowering the in-game settings, but the crashes kept happening in the exact same spots, which made me really paranoid about my hardware. I eventually went into the BIOS and set the pump header to 'Full Speed' and tweaked the radiator fan orientation to improve heat exchange. Checking Event Viewer, the frequent 4101 error codes completely disappeared, and I've played for 6 hours straight without a single crash. I did notice a slight coil whine after locking the pump to full speed, but adjusting the pump voltage to 1.15V quieted it down. Temps are now stable at 62-68℃. Compared the system logs and confirmed the temperature is flat, so the stability version is verified.