Not sure how to diagnose this

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... that coco is a Ca hog, if anything, you're light on it,... custom blending of such soil and soilless mixes is a dice roll,...better to cut it with something other than coco, which is itself a very peculiar substrate,...odd CEC properties mainly, but when used right is a fine soilless medium,... I know it's a common ingredient for other true soil mixes, but proportion is everything there, along with other formulations considerations,...
run-off is good, so pH is likely OK, but be warned r-o is NOT a reliable indicator of in-pot pH,.. plus the pH of what goes in is also critical in this, it must be clear water, not a nute solution or it'll be a skewed result, inaccurate,....
I'm still leaning toward a slight micronute defc., P defc. showing more as well, not so much K, the margin and tips aren't showing the browning out,... S defc., I don't think so, not looking quite right for that,....
I don't know enough about your nutes to tell you, unless they are true organics? ... if not, then pH adjusting before they go in is recommended,...
 
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