And what happens when the humidity in your country is constantly above 94% even when it doesn't rain and it is winter? Here, it NEVER gets below 80%.The breeder I got my bp from succesfully keeps over 100 ball pythons and he's never had a problem. It's all a matter of being extra careful when it comes to the hygene in the tub. You might need to clean it more often so as not to allow bacteria growth.
If you can get the humidity down by drilling/melting holes on the tub, then great! If not, double your cleaning efforts and don't lose sleep over it.
Just my two cents