ok i`ve never used that brand but it dosn`t matter what brand for the ppm and ph. have you looked at thier site for thier feeding schedule?
for my nute mix i like to be around 6.7 and the soil should try to keep nutral 7. the ppm of nute mix depends on stage of life, veg, pre flowering, full flower and so on. the ppm of the run off should be lower than when it went in and over the days of watering it should lower, pay attention to how fast it drops if it drops more often then you can probably increase mix. start at 1/4 of mix on bottle and as required increase.
i use botanicares pure blend pro series. completely organic and highly recomended. organics are easier to use, it`s harder to burn and fuck things up. and you realy dont need to flush ( only true organics)
how old are they and what soil? what light