A lot of info here !! Organics in your media shouldn't show a deficiency. I'm not sure what J means when he said organics need to be composted before mixing. I say this from topdressing my plants with organics all the time.I  think he might of meant mineralized instead of composted. Actually now that I think about it, the processes are similar. Anywho... next time you transplant a plant of any size, use some mycos sprinkled on the roots, this will help the roots a lot. I'm not familiar with light mix/coco but you could have nutes blowin right thru your media, or maybe not feeding enough. How was the veg ? Same media ? Overall they don't look that bad . Keep an eye on them.