How to fix blurry desert textures in Defense Grid at 4K?

In the vast desert, the fine textures of dunes became blurry, a loss of detail that was painfully obvious at 4K. I tried switching DLSS from Quality to Balanced; while I gained 8 FPS, the blurriness actually got worse, proving I needed to fix the sampling. I used the GamePP Image Sampling Calibrator to increase DLSS sharpening to 75 and locked resolution to 100%. RTSS shows the balance point at 72 sharpening, and GPU-Z confirms temps at 62-68℃.