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Could you have bottomed out on nitrates?

That'd be my best guess. I plugged your KNO3 dose into the fertilator and came up 4.2 ppm of nitrates. According to your calculations, you're also dosing 2.75 ppm of PO4. That actually yields an N-P ratio of less than 2-1. Most of the recommendations I've seen call for a 10-1 N-P ratio. Yes, I'm aware that some folks go for a lower ratio in an effort to bring out the reds in their plants, but even these folks usually aim for at least a 5-1 N-P ratio. I'd guess that in your "quest for redness", you ran out of nitrates and that caused the stunting that you're now seeing. Just my $.02.
 
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