Could it have been your nutrients?
When I started using coco,I was already using Maxibloom start to finish. I tried the lower range,issues would pop up here and there,be it ph,nutritional or environmental. The Osmocote was experiment...I couldnt believe it until I did it myself. Once,I adjusted the range(in coco) my "issues" seem to cease.
I'll add. We know all coco definitely isn't created equal,but once you dial in the coco of your choice,it's a very nice substrate with great results.
BTW,wassup Dope?! Glad to see you bro.