The pixel ratio is a function of the in-game sensitivity, the FOV, and the screen resolution only. No other variables affect it.
Given that it is not very convenient to change your screen resolution or FOV for this issue alone (given that there are pervasive consequences attached to those changes) you would simply reduce the game's sensitivity value instead, as this can be compensated directly for with DPI increase with the only other action requiring reduction in windows cursor speed slider if it bothers you.