Help with my Veg -

Hey folks, I'm currently using Fox Farms nutrients for my soil-based garden using R/0 Water that has a base PPM of 6. I'm vegging my plants out for 2-2 1/2 months before putting them into flower. Is it okay for me to add Cal/Mag and Nitrogen to their R/O water everytime I water them? I've had to add Nitrogen because my leaves yellow out even in veg if I don't because of the R/0 water. Is there anything I should add from the Fox Farms line up while they are in veg, or just give them PH'd R/O with cal/mag and nitrogen which I take my ppm's to around 250-325.
 
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