Lower leaves dying in flower

[rupertb]

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[Hazy Lady]

Looks like your medium is getting a little salty and the plants are not able to take up nutrients now, I would run PH'd water @6.8 until your run off is the same out as going in, then leave for 2 or 3 days before resuming feeding. You need to feed a couple of times to one water only and then it won't get so salty in your medium, you should allow some run off every so often and you'll catch any change in your PH before it affects your plants.

 

[rupertb]

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[KnuckleHedd]

The soil/ medium is way to hot for this stage of their lives. That curl down of the leaves is a dead give away. Probably too much N in the mix. I don't believe you'll be able to deplete the N by harvest time. Leaching should help remove some available N