I'm seeing sudden FPS drops in complex scenes on my MSI B450M MORTAR MAX. Should I manually lock the Vcore voltage to fix it?

While dashing through time loops, my frame rate would suddenly tank from 90 FPS to 30 FPS, which almost made me want to throw my motherboard out the window. I discovered the auto-voltage on the MSI B450M MORTAR MAX was jumping between 1.1V and 1.35V during heavy load shifts, causing the core clock to plummet. I tried the 'Ultimate Performance' power plan in Windows, but that actually made the voltage swings more erratic—total rookie mistake. I went into the BIOS advanced voltage settings and locked the Vcore at 1.28V, then set PBO to 'Enhanced.' Using a frequency monitor, the CPU clock finally stabilized between 4.2-4.4GHz without those jagged drops. My CPU temp spiked to 92℃ initially, so I had to refine the fan curve and nudge the voltage down to 1.25V to keep it safe. VRM temps are now 58-64℃. I switched the performance mode to 'Extreme' in the MSI software, and the GPU is holding steady at 66-71℃. It's finally playable without the hitching.