Your 3080 sounds broken, ill take it off your hands
Have you tried reloading shaders in thegame menu and/or removing everything in here?
C:\Users\%username%\Documents\Call of Duty Modern Warfare\players
Yeah shaders automatically re-download/install when it detects new drivers but yes also have forced it manually. Haven't tried removing stuff in there, shall I just cut everything from that folder out ?
I did try a full scan/repair via battle.net but no luck there.