I use the ppm/EC meter as a exact measure for how much nutrients I’m giving them. I NEVER use the nutrient manufacturers levels. I raise the levels each week by 100 ppm/0.2 EC until I see a negative reaction from the plants ie nutrient burn then I back it off to the last ppm/EC level I had before I saw the burn/problems and just keep it there for the remainder of the grow. At the moment they sit happy at 1000 ppm/2.0 EC. The meters allow me to push them to the absolute limit. More food = bigger fatter buds 
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