Just got my Peters order in. FWIW, I think I found the Holy Grail for a complete, start to finish fertilizer. It's Jack's Classic Peters Citrus FeeD, a 20-10-20. Compared to their popular Blossom Booster it has more Mg, 1% versus .50%, more Fe which is tripled chelated (EDTA, EDDHA, DTPA) to take into account any kind of soil chemistry, .15% versus .10%; 4.9% sulfur where the Blossom Booster has none, and more of an acidifying affect. 11 elements in all. Soil growers should check it out. What that formula suggests based on my knowledge of cannabis nutrition is a greener plant (think Fe, S, Mg) with less stretch and an excellent NPK balance to support foliage, roots, and flowers.
Uncle Ben