My first question would be what are you using to heat the enclosure and to read the temps? What are the temps reading in the hot and cool side? What about humidity readings?
Generally, I dont believe coco fibre should feed damp or cool. How long after mixing it with water did you add it to the enclosure? I used a brick of coco husk for my bp and when I first added it, it was slightly damp. However, after about two hours under the bulb I'm using it dried out, now a week or so later it is more or less completely dry.