Why are character faces blurry in Rule the Waves 3 on the Soyo B660M Classic?

In 4K, DLSS Quality mode made faces blurry, losing fine metal textures. I tried switching to DLSS Balanced mode, which increased FPS by 8 but made the blurriness worse. I used GamePP DLSS/FSR Image Sampling Calibrator to raise Sharpening to 75 and set render resolution to 100%. RivaTuner confirmed effective render pixels increased, and HWiNFO showed GPU temps stable at 56-62℃. This switch restored the aesthetic appeal.