Glad ur girls are fine
You do need to remember that Coco takes a lot of water. What happens is the Coco will absorb what it needs... the left over is what your plants get.
Good rule of thumb is let it run out the bottom for a bit. This way the fibers/croutons or whatever you have get theirs and then ur plants gets plenty
Do some deep research on Coco for the different stages of marijuana growing in Coco
and you can get some great yields and tasty buds