How do I deal with these sudden, jarring frame drops during massive combat encounters in Assassin's Creed Valhalla?

Having the screen freeze for 0.3 seconds right as I swing my axe is a total nightmare in an action game. The high-frequency nature of the Asgard Snow DDR5 6400 creates unstable voltage swings at 1.35V when handling the massive unit counts in Valhalla, leading to severe checksum errors. I tried updating to the latest BIOS, but while compatibility improved, the random hitches remained; software patches can't fix physical instability. I went into the advanced voltage settings, manually pushed the VDDQ from 1.35V to 1.40V, and tweaked the memory refresh rate from 1x to 2x. After running MemTest86, the error count dropped from 5 per hour to zero, and the input response became pinpoint accurate. I did hit a wall when temps spiked to 60℃ after the voltage bump, but adding a small heatsink brought it back down to 50 - 55℃. Frequency is stable at 6400MHz with latency sitting at 62 - 66ns. Three hours of gameplay and zero crashes.