You have listed two plants that are notorious nitrate sponges. Riccia in particular. I had trouble maintaining nitrate levels in the old incarnation of my 75G when I had that great mass of Riccia.
What else do you have growing? You plants could be gobbling nutrients.
Aqua Soil II vs. Aqua Soil v. 1.0. I am wondering how much that issue that is coming into play?
I think that may be an issue for you and CL, Homer. We all need to remember (me in particular) that we are dealing with a new product, so results mat start to vary. I wouldn't go so far as to say you are blaspheming the ADA favoring crowd, as much as possibly experiencing a new product and it's results!
Wood did not dose N, but dosed iron, which I would and micros too, which I would as well. Without checking, I think I'd dismiss the macros in the Kent product. I think you'd have to dose a heck of a lot in order to make a dent.
Wood dosing P? I can see the P. Phosphates can act to reduce algae. To what level was Wood dosing I wonder?
Mike