Ball python humidity?

Every thing I read seems to have a slightly different answer. I have a baby ball python, only a few months old. For now he is in a 10 gallon cage. I monitor the humidity and by using a mini humidifier in the cage and misting twice a day I keep the humidity at about 50-60. The temp on the warm side is between 88 and 91, and the cool side is 78 and 85. Some people have told me that that is the perfect humidity, others have said that using a humidifier in such a small cage can cause mildew and problems with my snakes scales. As long as I keep the humidity levels right, I don't see why the size of the cage would matter, but I'm not sure. All input would be appreciated.