I'm not aware of this 60ppm myko's sleeping routine, however, I don't grow hydro but organic so I don't look that much at individual nutes... actually mykos are the No1 source for P-delivery or accessability, as P is oftentimes largely abundant in a soil but a plant cannot reach it.
But you are in Coco's, and feeding mineralically, so it's entirely different... your bottled nutes should already contain free-accessable P... furthermore, a good way to boost mykos is actually Nitrogen, plain and simple. Don't even know how Mykos develop in Cocos, though...
I see some yellow bottom leaves, plus alot of bottom leaves got striped. Were they all yellow upon the time of their removal?
Nevertheless, looking healthy