Well written, Marc,
Jared can look to his own state Md for their excellent SLAN approach http://mda.maryland.gov/resource_conservation/Documents/nm_manual/I-B2%20p1-11%20s6.pdf
especially if he has loamy sand but that is mostly about NPK.
My land has an excess of Calcium, and a lack of Mg and K (which I am trying to solve) but I am not troubled much with insects or
disease. we grow 1/2 A of open pollinated corn and 1/2 A in gardens, The produce tends to have high Brix, dehydrates and doesn't rot.
We don't have irrigation and this is the driest part of NY and my land is sand and loamy sand.
I think the micronutrients are very important and The Ideal Soil ratios are working out very well for me.
We use Logan Labs and I did a Paste test on the worst garden B, Cu and Zn were not measureable. K and Mg were 1/3 of what they should be.
Ca, P, Mn, Na were on the low end. S and Fe were sufficient