Yeah, enzymes are good idea in coco, imo.
When i stop using enzymes in coco i get root problems. I use it until the final weeks of flower, usually at 1/2 - 2/3 strength.
There are alot of opinions on Enzyme additives. This is just my opinon.
My worst root problems and root pest problems came near the end of a 6-8 month period of not using Multiyme.