I'd avoid wetting the substrate, particularly since you're using newspaper. It won't really help your humidity in that case. If you can experiment with your water dish, you'll probably find some way to reach the humidity you want with it. Some things you could do: use a bigger water dish, move more of it onto the UTH, or switch to a ceramic or glass dish (Pyrex pie dishes are <$3 at WalMart). Alternatively, you could just mist the sides of the enclosure each morning and that would probably create a big enough boost (but requires that you add that to your schedule).