If you have condensation, your humidity is alot higher than 65 %. More like around 100%. How are you measuring your humidity? Also sounds like your airflow is off. I have an emerald tree boa and green tree python. Both require high humidity in their enclosures. Even when I peak my humidity at 80 to 85 percent, I do not have condensation. Condensation=stagnation as far as airflow. I have never used coco fiber. I do know when I use new cypress mulch for my BP, I have to dry it out initially cause it's so moist. I do that by putting it in the oven for a bit. Anyways just my 2 cents.