Keep his water good and fresh-- change it once daily, or twice if it needs it. Also, I'd forgo the pre-shed bath, as it can wash away oils he needs to keep his sheds running smoothly. What is your general humidity reading? Husbandry check-- hot spot/cool side temps? When was his last shed? And lastly, what are you currently feeding him? Believe it or not, BPs get an awful lot of their water from their food intake, so his prey may need to be adjusted as needed.