The biggest problem I see with this issue, especially wetting the shavings is the risk of infection to the chicks from dragging their umbilical cords through the moisture, especially if they have any umbilical hernia. I lost one to mushy chick disease, or peritonitis last year, because I went over board trying to get the humidity up after a shrink wrapped chick. there were wet paper towels in there, and the last one to hatch was rolling around in the wet paper toweling and debris from previously hatched chicks. They need humidity, but also a very clean hatching environment IMO. (Of course this doesn't match the broody hen environment!)