How do I stop the screen flickering in Dead Space Remake on my Sapphire GPU?

It was maddening when the isolation zone lights flickered wildly. I tried lowering ray tracing, but it only made the shadows look worse. I used GamePP Shader Compile Queue Manager to clear 6.8GB of cache. RTSS now shows stable frame times at 13-16ms, and HWiNFO confirms GPU temps are locked at 60-64℃. The immersion is finally back.