Soil for hydro fertilizers

I have looked around and can't seem to find out.. I feed my babies with some hydro fertilizer every other watering .. I'm trying to find the best soil to use w no nutrients since I add my own. Currently I'm using jiffy 100% organic seed starting mix ( like 45% peat moss , 50% Vercumilite , and lime juice ) Im wondering for next grow should I just mix my own peat moss and Vercumilite ( or is there a better mix?) cuz I think the lime is making it to acidic and burning em I water them with 6.5 ph water.. I just don't want to get some miracle grow mix and then nute burn them to hell.
 
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