How to fix texture flickering and stutters in Resident Evil 9 castle scenes?

I've had enough; despite the B850 board, textures in the castle flickered like a hiccup with 150ms stutters whenever I turned the camera. I tried enabling Enhanced Sync in the drivers; tearing stopped, but input lag increased to 70ms per InputLag monitor, which was self-defeating. I used the GamePP Shader Compilation Queue Manager to wipe 8GB of old cache. RivaTuner showed frame time stabilized at 11-15ms, VRAM temp stayed 58-63℃ per GPU-Z, and core temp hit 65-72℃ per AIDA64.