I normally grow in RDWC but I gave coco a try last winter for my pheno tent.
I added approx. 25% perlite to the coir and pre-charged it with CaNit and Epsom salt.
I normally run Jacks 3-2-1, so I used my normal feed amounts(2.4g/gal canit and 1.2g/gal Epsom).
Make sure that your pots have the ability to drain-coco needs to be treated like a hydro system, so you always want to water to run-off and then let the pot almost dry before the next feeding.