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Heat and humidity in relation to your soil/water salt level. The plants are transpiring faster then they can take up the water because of your heat/humidity and the abundance of salts in the soil. Lower the heat, raise the humidity. and give them a good flush.

Yea, you are throwing too many variables into the mix. Then adding your additives and catylsts, etc. which is making things further out of wack. Then if you don't flush or water with adequate run off, you'll get salt build up. I've never used fox farm but from what I've read, it's pretty hot...

They look beautiful.

Exactly. Not needed.

Once your grow media dries out, it repels water. Dropping the pot in a bucket of water and letting it soak up is a good method to re hydra and not over water. The media takes up what it can. Judge by the weight of the pot/plant.

When the stems droop, it's too long in my opinion. If you incorporate enough perlite in your media over watering shouldn't be a huge issue. Why let the plant stress and wait for water. When it droops, the plants cells are lacking water and the cell wall can't expand to their proper form. Plus a...

I don't have an answer to that. But I'll never ever need any fertilizer with a P value of 59. Or a ratio so far imbalanced. Maybe for and outdoor grow that you couldn't frequent enough.

These were my 2 thoughts. But a full plant picture would help. If it was heat, the tops would be affected the most. Or potasium/mag. Whats your nutrient formula? numbers? brands?

Most likely the medium is too dry, so water with little bits at a time to let it percolate down instead of repel and run off and down the side of the pot. Water multiple times until the medium soaks up the water. the pot will become heavier. Misting is also a good option for immediate relief...

How close are your lights? Doesn't look like its over fertilized, actually, looks under.

What's your run off EC/ppm?? Half strength every 3rd watering seems a bit low?? Also all that much potassium added to bring the Ph up might be causing an imbalance/salt burn when the medium dries out. I'd ease up and water at 6.0 and have less potassium to imbalance the mix. 6.0/6.2 is a...

What is your runoff EC?? and PH? You might not flush everything out the first time.

Read the plants. When they are firm and standing tall, they are loving the environment. When they start to droop a bit is the indicator that they are running out of water and can't keep the cells hydrated enough to stay firm and do their job. Probably lockout/PH imbalance how much have you...

Waste of money...

Flooding and draining both at the same time would be ideal. one res, one pump, 4 pipes, 2 grow beds. Pretty simple. Put valves on the inlets since they are at different heights that way you can control the flow. The lower table will get more flow so you close off it's valve a bit until it...

Waiting to see deficiency isn't the best practice. She looks hungry.

Your second table would have to be an NFT variation. I don't see any way to flood it to a certain to a height and drain it with gravity feed water. Like someone mentioned earlier. There is and inlet (lower level) and a drain pipe (tallest) in an EBB and flow. The pressure from the pump fills...

Did you feed it?

Most likely a Ph issue, getting worse by the salt build up. To me if the water is going in at 6.9 and coming out at 5.8, that's and indicator of the soiling being more acidic then your water. That's not to say your soil Ph is 5.8, but if the water is coming out more acidic then it's going in...

I think it's UVB that promotes resin production. The plants resin is a defense from the sun, drying winds, and insects. ;o)