Well, you should look around for the myth of potassium, here on RIU. My other Uncles might have a lot to say about that.
I use 16-16-16 at increasing strengths for 14 weeks, then back down for the two weeks at the end. After 8 weeks, I change from 24 hr light CFL to 12 x 12, HPS@ 1000w.
And you can read my journal. I have been very honest with myself. I used think that was all correct.
Now I say, why bother? The plant is getting, we are not giving. When she wants, she gets what she wants, if it is there.
So, I have been dead lost in all this. And if it doesn't please you, it sure pleases the ones I gave my hundreds of special dollars to, for this.
What matters is concentration. If it is all there in similar but, not shocking, concentrations, the girl is at the buffet, dog.
Pick and choose, time. I set out a little Silica and Cal/Mag, treats, as well. But, I always mind the concentrations.
I grow in coir and clay balls. Feed every day. They take what they like and watch their waistlines get....Rubenesque.