Creality K1 Tramming -- Loosen Z Screw and Tune?

My Creality K1 bed is actually in pretty good shape (max deviation of 0.7mm left to right, 0.1mm back to front), but I recognize that many folks might have beds that are off as much as 1.5 or more mm. The K1 has 3 lead screws, but not proper 3 point leveling (maybe someone will create a daughter board and a 3 point conversion...