My Valkyrie V360 LOKI makes a high-pitched humming sound during low-load scenes in Apex, how do I stop it?

During those quiet moments when I'm hunting enemies, my case would emit this piercing, drill-like high-frequency whine that made it impossible to focus. The Valkyrie V360 LOKI pump runs at 3200RPM by default, which created a 120-150Hz resonance with the metal chassis panels at low loads. I tried dropping the pump speed to 60% in the BIOS, but the CPU temp spiked to 82℃ instantly, which scared me. I ended up building a dynamic curve: 70% pump speed for 40-60℃, and a linear ramp to 100% above that. Using a decibel meter, idle noise dropped from 42dB to 31dB, with peak temps capped at 74-79℃. At first, the pump kept jumping between speeds, creating a weird pulsing sound, until I set the smoothing time to 3 seconds. Water temps are steady at 32-36℃ and RAM is sitting at 58-63℃.