I agree with both of the other suggestions and will just toss in my 2 cents.
I currently use tanks as well (setting up my AP T10's today when I get home from work). In them Zoo Med cypress mulch, a uth and a light (75W). Have a hide on both sides with H2O bowl in middle under the light. On the screen cover I used a reflectix type product with a hole cut in it for the light to sit directly on the screen.
For humidity, I keep the substrate dampened (it's a really light color when dry and when damp it darkens up and if you use it you'll see what I mean) but not wet/standing water. When she goes blue to shed, I usually add more water to the cypress and also put damp moss in both hides and have had 4 perfect sheds thus far. Humidity levels have ranged from 45-60% (with 60-85% during sheds of course)
I am setting up my AP T10's with Herptopia coco husk based on other members experience and the vlog Brian Barczyk did. Hopefully that will keep humidity as well as the cypress has.
Hope that helps a little - good luck..it's so satisfying when you get that 1 piece shed. You'll get there eventually.