Have you considered using Jacks Hydroponic 5-12-26 with Calcium Nitrate 15-0-0 and Magnesium Sulfate in the 321 ratio? Works great in soil and very easy to modify the strength depending on the lifestage of your plants. I use it with tap water and never bother with PH or PPM measurements. Simple and eliminates all the bottles of magic elixirs. I use it every watering; 1.8g/1.2g/0.6g for seedlings, and just increase as needed in the same ratio. Mix the hydro and MgSO4 together and the CaN separately then combine.
I can discuss it further if you are interested. I add nothing else and use it start to finish. Here is a shot of my latest grow five weeks from seed; left to right Fire OG, Wedding Cake and Gorilla.
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