Your theoretical K level is aligned with marschner in Terms of N:K, coincidence?Guys, I don't want to disturb your - obviously dedicated - EI party, however there are also different worlds around.
Firstly, dosing 30 ppm NO3 is insane in itself. But IF I ever had that much nitrate in my tank (and no ammonia), I would dose 4.7 ppm K, 14.7 ppm Mg, and 48.5 ppm Ca. There's way too much potassium there. I don't know what CO2 injection can do, but I'd expect a serious case of Mg and Ca deficiency. Plants prefer potassium to magnesium and calcium because in natural waters, potassium is usually in short supply.