how important is humidity to a ball python's health?

[kitedemon]

Ok so if I am using a tub with UTH and newspaper substrate, and how do I keep the humidity down? I have holes drilled in the sides and a small water bowl. Everything seems to be good except the humidity being mid to high 70's and some time in the. 80's.

More ventilation. holes along the top edge are not very efficient. Warm air rises and escapes but allowing cool air in the cycle has to reverse. So the tub breaths in and out. Air holes low and high will allow cool air in and warm to escape.