Hey GTO,
OK I will try and help but like Jig, I am a hydro guy.
From what I understand most nutrient def. are caused by two things. One, there are no nutes or two, the plant can not use the nutes.
You have stated you are in FF soil right? Well they make a couple. If you got Ocean forest then that isn't the deal. You got enough nutes for plants that size. That means your plants can not use whats there.
Here is what I would do. I would go to the nearest pool supply place and get a Ph test kit. Not the strips, the type where you take a sample of the water and put drops in it so it changes color and you compare it to the chart. Like $15 for the kit and some up and down.
Then I would get some 5 gallon bottles of distilled water and water the plant until the water dripped out the bottom. I would take a sample of that run off water and check the pH.
Then I would pH adjust the rest of the distilled water (my guess would be to 6,0) and flush the plant. I would stop feeding it for a week or so and start back with half as much as I was using. (if any) Ocean Forest is nutrient rich.
I am not sure but I don't think you need nutes until you flower with that. You may want to consider transplanting, keeping the ocean forest in the upper root system but neutral mix under that and slip in a feed tube. That way you can feed the roots the flowering nutrients directly.
Sorry for rambling, I think your problem is your Ph is too high.
Good luck man.