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

[Teacher's Pet]

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.

My issue is the opposite. I'm still trying to increase the humidity because it hovers in the 45% range. I also keep fiddling with the temperature on both sides. First it was way too wide a range (78°-98°!!) and now it's all the same (86°) on both sides.