Nitrogen Toxicity in rdwc?

I’m in Rdwc hydro and two of my three plants have droopy leaves.

Ak47 and Bubblegum are droopy while white widow looks good which doesn’t make sense to me since they are all getting the same stuff.

Currently using jacks 321 at 1200 ppm on and ec is at 2.6 (just added nutes but skipped on part B)

Getting 600 on ppfd

Any thoughts or do I just need to flush

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Whats your ph? How close is bottom of net pots to the nutrient solution?

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Ph at 5.8

Cups are probably touching the source

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Lower your water lvl to around 2 inches below net pots