Flowering Plants- Severe Leaf Dying

Ok so here is one of our plants, about 2 weeks into flower. It's leaves started yellowing eventually going totally brown and crispy and dropping off. The worst leaves appear to be the biggest fan leaves in the middle of the plants. We first thought deficiency (see Deficiency Eating Plant, in this forum), so we added more nutes- made it worse, so we flushed and backed off the nutes until now. We left them alone for only a day and came back to the leaves looking way worse than before. pH is around 7, so that should be fine. Can anyone enlighten me to what is wrong?

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looks a bit overwatered IMHO.

that might be a possibility, i will pay better attention to that- but i don't think overwatering is causing the leaves to die like they are

last night i gave it some 1/2 stgth. fish emulsion pH'ed and the plants perked right up. looks like its reaching to the lights not.

but the yellowing isn't really related to that, we'll see if it stops. i think it's nitrogen