80% isn't a problem as long as you have good ventilation the real trouble is high humidly and no air flow is a breeding ground for nastys. Coco will dry out quickly if you want to drop it quickly manually with no water break up some and mix completely dry in to the damp it will drop it by 4-6% if you have enough.

The fearful snake is a real complicated issue, I usually start slow, frustrating but just reach in a slowly touch the sides of the animal for a few seconds then slowly with draw try that once or twice a week, and slowly increase the time and frequency best also to do so in the night when the snake is alert. Hopefully the reaction to your hand will be less and less. try to hold him on your hand still in the enclosure and do the same thing. Then a few minutes at a time until it gets 'used to you' the problem is so never do. Some adjust really quickly and some don't. They are each different.

Also this sounds odd but wash a bit of cloth in your laundry and then carry it close to your body for a while a few days say, (I were it tied around my ankle at night...) and then place a bit in both hides. The idea is that the animal will become accustomed to your scent and will associate it with the security of the hide and hopefully will not have as strong a reaction. I have tried it twice and maybe it worked maybe not in either case I have one snake that was totally freaky about being held whom is not now and a second who was absolutely crazy when being held and even doing simple tasks in the enclosure now ignores me in the enclosure but still doesn't take well to handling.