Uh, nothing, absolutely nothing wrong with that ratio if that fits your nutrient requirements. Have you looked at our soil tests? How would you know? I look at hundreds of soil tests for corn, literally, every year, and I don't know in advance enough to automatically discount the wisdom of such a ratio.

The thing I have problems with putting out so heavy on zinc, maybe other metals that can have long term adverse effects. I also do not like paying for "filler" that is worth NOTHING.

Our soils fluctuate a lot, especially in K, Ca, Mg.