How to fix Assassin's Creed Valhalla blur on ONDA 9D4-VH-D with DLSS Quality mode?

Faces looked blurry in 4K. I switched to Balanced mode, but it got worse. I used GamePP DLSS Calibrator to set sharpening to 75. RivaTuner confirmed sharpness restoration, with GPU-Z showing stable 2610MHz frequency.