...I've used a couple different line of products. "Plantlife products" (Bada Bing, Bada Bang, Bada Bloom) and General Hydroponics.
...what I found out is, all of the N-P-K values are about the same, and it looks like General Hydroponics set the standard, so, I use GH, and I use the Lucas Formula feeding strategy. I only change out my res. inbetween veg and bloom, then flush. If your interested in knowing more about it, here's the link >>>
https://www.rollitup.org/hydroponics-aeroponics/4387-lucas-formula.html