After two hours of Apex Legends, my Maxsun B850M-K has voltage drops causing FPS loss. Change power plans?

I thought this build would be rock steady, but during final circle fights, the core voltage would slowly bleed from 1.2V down to 1.0V, which absolutely killed my frame rate. I first tried capping the CPU at 99% in Windows, but my minimums dropped from 80 FPS to 60 FPS—the frustration was real. I went into the BIOS, switched the power management from Power Saving to Ultimate Performance, and locked the Load-Line Calibration at 1.22V. In HWiNFO, the voltage stabilized at 1.21-1.24V, and frame times tightened from 12-30ms to 8-15ms. When I first hit Ultimate Performance, the CPU spiked to 88℃, so I had to set the fan curve to 'Aggressive' to bring it down. Now, memory is at 45-52℃ and VRMs are sitting at 75-82℃. Switching the performance mode fixed the Vdroop, and my frame times are now a consistent 7.2-9.1ms. Still runs a bit hot, though.