klibs is pointing out some important aspects. We need to understand that the main idea behind the Estimative Index is that we provide plants with more than enough ( non-limiting) nutrients, controlling growth from light and plant metabolism rate. The sugested mass concentrations ( ppms) are assumed to be non-limiting even at very high light. At lower light levels and with plants with lower metabolism rate, non-limiting nutrient levels could very well be 1/4 of EI , as klibs suggests. For example, there is no need to know precisely that your aquarium uses 5ppm NO3 /week. If you dose 6ppm NO3/week you are walking the line, but if you dose 10ppm NO3 then you are covered with room to spare.
Think of it this way, how large is a non-liming food supply for a baby, for a teenager, for an athlete or for a static old man. I would only go full EI when you are starting dosing CO2. If after a month you feel you are dosing too much of something you can start cutting down on things. But now you have seen how plants grow in unlimited nutrients ( see first link).
There are premade GH boosters such as GLA Ultimate GH Booster or Nilocg GH Booster. The ppm in each vary, I have seen 3.2 K; 0.55ppm Ca and 0.66ppm Mg suggested per day. Hope you can come up with the ratios for the chemical from this, if not PM me.
On hiatus till later this year