Hi Kekon, it seems that you discoverd something useful about plants fertilization. I tried the EI method too, but I had only problems with no end: curling plants, and many kind of algaes.
I try to mantain the P-N ratio what you advised and I also add 20 mg/L K at every water change.
I started to like the result
But I have one question for you about micros. What is your opinion, how much CSM+B should I dose after water change or daily?
Best wishes, Aquamaniac