You can not use only the major nutrients NPK in hydro without minor nutrients. Further running 1400 PPM is far to many of the major nutrients.
You are missing iron, copper, manganese etc... Either transplant to soil and continue mixing your own nutrients or move to a hydroponic formula that contains all the micronutrients you need.
I run 50/50 coco/xlg perlite and use 3 part General Hydroponics Flora Series according to their drain to waste chart. You can grow good plants in either.
Here are mine a day or so ago, Coco/Perlite with GH Flora Series.
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