I follow the label and the pH is 5.9 to 6.3 usually
1.3 ec 700 ppm. most the labels i have say double or more than that and it's way to much
imo, doesnt matter if using multiple different nutes combined, just a waste of time, brain power ect. and probably not as good as a quality general purpose nute close to 2-1-2, start to finish, so long as after you mix them you end at 700ppm/1.3ec.
check meduim or runoff ph and ec to see what is going on in your medium my guess is e.c./ppm to high and excess nutes messing with medium ph also