Quad43 Hi. Thanks for sharing that info - I presumed this was going to be a widespread problem with display technology and now I'm more convinced.
As for dithering - when you open the Nvidia panel in Ubuntu, there is a place in display options where you can switch it off, or choose its type: "Static" / "Dynamic" / "Temporal". Never done it in Windows.
Turning dithering off gave me only partial relief. Within days my eyes were exhausted again, by sth else. Dithering must be merely a factor which makes the primary one stronger. Fun fact: "Temporal" was as easy as "Off" for me, "Dynamic" (or "Static") was a nightmare.
Could you describe your Precision setups (all of them) in detail? I'm thinking of an upgrade to UHD to see if it helps.