I fixed my issue! For anyone who is interested in this topic, if you’re also experiencing strange grainy or crosshatch looking textures on water shadows, or where the water meets land, here are the settings I used to get rid of that ugliness:
In Nvidia Control Panel:
Anisotropic Filtering: 16x
Antialiasing FXAA: On
Antialiasing Gamme Correction: On
Antialiasing Mode: Enhance the application settings
Antialiasing Setting: 2x
Antialiasing Transparency: 8x
Low Latency: Off
MFAA: Off
Texture Filtering - Anisotropic Sample Optimization: On
Texture Filtering - Negative Bios LOD: Clamp
Texture Filtering - Quality: High Quality
Texture Filtering - Trilinear optimization: On
Everything else set to default.
In Conan’s game settings, turn off Post Processing, and set AA to 2x.
It lowers the quality of the water and water reflections a bit (you don’t get all those fancy water rippples), but everything is smooth, texture qualities are high, the water still looks good, and those crosshatch shadows are gone.