OK. So next would be to find which resolution fixes the screen problems you're seeing.
For us on mini-pcs, this is dictated by the dummy adapter plugged into to the display-port socket.
Some resolutions work better than others, some not at all. Our sweet spot is 1600x900 which seems to scale ok to 'phones, tablets or WHY alike.
Sorry, I can't remember how the pi deals with this but therein lies the next bit of the puzzle.
HTH
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