Why does my Valkyrie V360 MIST pump speed drop during intense Aka combat?

Frustrated by sudden frame drops in Aka combat, I found my pump speed dipping to 1200 RPM. Restarting the water block didn't work; the anomaly persisted. I used GamePP Fan Curve Configuration Panel to force pump speed to 2500 RPM with a 2800 RPM upper limit. Cinebench stress tests verified CPU temps stabilized at 75-80C, reducing frame time variance from 15-25ms to 8-12ms.