Do you have a picture of this deficiency? It should be in the newest growing shoot. Iron deficiency is something I've seen once or twice a long time ago. There is more than enough chelated iron in all of our formulas. My hunch is there is something else going on.
What is your soil ph? It almost sounds like you have an over-abundance of one, or even 2, elements in your soil that is interfering with the uptake of iron. Or the ph is locking it out.
My concern would be: it's likely there is already enough iron, but it is inaccessible. By adding more, instead of finding out why, you might build up too much iron in your soil, which could lead to inhibiting the uptake of something else.
Do you have recent soil and water analyses that you can send me?
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