you are in full bloom, you should follow ADVNuts instructions and feed at 4 mL also and especially with Grow, if you use ADVNuts add B52 (vitamin B and potassium)
you could flood the substrate and measure ec of the draining water
so as to get an idea of the amount of missing nutes
i don't know coco grow well, but i think you have to load up the elements, coco is much poorer in nutrients compared to soil
Thats my two cents
Hope it help, good luck buddy! 🍀🍀