Why do you not use your EC pen? Yes i do have one and just reminded me i forgot to get the new batteries for it. It is very important for a grower to know what EC is and how it works there is a good article explaining it on the canna website if you wish to search it. Really at your stage of growth you want plain sailing to the end now. A & B with the boost will be fine as long as you are not giving to much A & B. You should be looking at a EC of 1.0 - 1.2 around your stage of growth depending on the size of the plants and if they hungry bitches or not.
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