You really do not need that much light to grow anubias sp. ferns etc, dosing looks good based on a reasonable amount of light, I think you may be pushing things a bit to hard and expecting to much from it, without completely understanding what is happening or what needs to be done.
Tweak down the lighting a bit, add some Excel to your regime for a week or two, and stay on top of your dosing regime!
If you skimp on dosing look for trouble or reduce the light even more.
I have been using iron chelate from Greg for a few years with no problem, but if you feel you need more iron, just add more trace until you can get some.
Although, iron is not the problem.
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