The "best" ratio is one that provides each element sufficiently but does not lead to an imbalance over time (as in has too much or too little from one or more elements). What that best ratio is varies a lot. E.g. per pot size, medium, hydro setup, veg duration, fertilizing methods (fertigation vs premix) etc, etc. Plants, and not a nutrient manufacturer or grower, dictate what the best ratio is. It's often not a low N ratio that is the problem but the imbalance, causing stimulation/synergism and antagonism, both indirectly resulting in deficiencies (the former because it depletes faster).
High P reduces zinc and calcium uptake
High K reduces magnesium and calcium uptake
Add calmag based on calcium nitrate and it will unfuckup the situation a little, at the cost of wasting nutrients.
I think I'm going to prepare a new product too, I will call it MaGic, in case high N ever becomes a trend.