I'm getting stutters during heavy combat effects in Tales of Arise on my ASRock B450M-HDV, how do I fix this?

Whenever I trigger a big ultimate, the game has these tiny, annoying hitches that make the combat feel clunky. The default RAM voltage on the ASRock B450M-HDV R4.0 is only 1.2 V, and I noticed latency spikes of 12 ms - 18 ms during heavy data swaps. I tried dropping the graphics to Medium, but while the FPS went up, the stuttering was still there, which told me it was a hardware bottleneck. I went into the BIOS, carefully bumped the DRAM voltage to 1.35 V, and tightened the timings from 18-22-22-42 to 16-18-18-36. Monitoring with RivaTuner, the frame times stopped swinging between 16.6 ms - 42 ms and settled into a clean 12 ms - 16 ms range. I actually messed up and set it to 1.45 V at one point, which bricked the boot, but a CMOS clear fixed it. RAM temps are now 40℃ - 46℃, and the VRM area is around 55℃ - 60℃. After three hours of playing, the stutters are gone, and core voltage ripple is only 0.04 V.