I use glass exo-terra tanks to house a pair of BP's that I like watching cruise their homes under the red light at night.
Initially humidity was an issue until I started mixing exo-terra plantation soil or jungle soil(which I believe are very similar to eco-earth) in with the repti-bark that makes up the majority of the substrate.
I found that cutting a few pieces of Plexi-glass/Lucite or any similar substance and drilling a couple finger size holes in it allowed me to cover any number of the 4 screened parts of the top.
The mixture combined with the controlled moisture loss means I now only have to mist 1-3 times every 2 weeks unless a snake is in shed.
The substrate also does not seem soggy ever.
What type of habitat do you have?