Yes, afraid that was the problem. A tester is so helpful.....you really have to reduce dosages after (or if) you overnute (as I have in my day) but then they certainly need their nutes to flower with. I don't know really how much differet aero would be from my bubbler ppmwise considering the spray .....my plants are usually at about 800ppm (using R0 water I start at 15ppm) when I turn them and the one time I ran into iron troubles was when they were at 700 and should have been at 1000 or around there. You may want to contemplate holding off on turning them until they are up there a ways. Keep careful watch for overnute....curling edges, etc (I don't think you will see this because I think they will soak up every nute they can find but...) and keep upping them slowly. Hopefully you will soon have some normal plants.