The light green leaves in coco isnt always a N def. Most of the time its actually a Iron def because most Nutes do not add extra Iron to compensate what coco does. It releases K and drains Ca, Mg, and Iron. Cutting edge Plant amp & Mag amp might need to be used at full strength. Also don't use Uncle Johns Blend in coco as it will only add More K to the plant and have a negative effect like OD and lockouts of Micro nutes. Lastly before you add Plant/Mag amped I found if you PH your water to 7-7.2 before adding ANY nutrients then add them its more stable and gives better readings. So order should go Ph water to 7, add Plant/Mag amped, add Silica, add Sugaree/Sour Dee/Grex/ect, add Base (Grow Micro Bloom). That will keep lockouts from happening and let the PH adjust so by the end you have a much more stable point to then further adjust the PH to 5.7-6.0