If coco dries out, water slowly with some yucca wait a few and water a little more etc. Or you can use another wetting agent. Peat is the one that is really hydrophobic.
@Lil Dab,
@Frank the Dank did a write up on his watering program in one of his grow threads. He said he's changed it a little but still works. I do something similar in 5 gallon pots. He uses pro mix, but I use canna coco brick, but works.