bman, from what I've seen from nutrient formulations, 4-18-38 for tomatoes and 10--8-32 as an all-around. Came across some interesting info from our cannabis grower friends on aeroponic growing. You have seen the nutrient availability charts at given ph ranges, well there are two charts. One for growing in "Mineral Soils" and the other for "Soiless Mix". And the main difference is the uptake of Phosphorous and Manganese. The thread also has excellent information on micro and macro nutrients and how the plant uses them plus other info on aeroponics.
bman, I think ph could be another part of the puzzle concerning your problem. Dropping it to 5.8 temporarily might tell us if we are on the right track. Here's the link to the thread I was referring to. Ami
http://www.icmag.com/ic/showthread.php?t=52431