I'm having the exact opposite problem with my tubs. I can't get the humidity DOWN. it's currently at about 70-75% constantly. I've moved the bowls off the heat, and done all the re-arranging I can, but nothing seems to be helping... Newspaper as substrate.

It DID help with my girl's last shed though.. This is her first shed with me (she had shed the day I bought her) and it was all in one piece. It was a "donut" shed, but I was able to get it unrolled in one piece even...