I may not be the best person to answer this question since i'm only experienced with only one species (Avicularia avicularia) or Pink Toed Tarrantula if you preffer.

But personnaly i think you're doing fine. I even think you're giving too much importance to humidity and heat. You're definatly not doing anything wrong by caring for those things but tarrantulas don't require as much attention on that part. I know reptiles do but not tarrantulas.

Also if your T. does use whatever you gave her for a burrow, it's always a good sign. It means she likes the place and she's installed herself permanently.

All you gotta do now is to make sure she gets the food you give her and also make sure she has a water source. They don't drink alot but they still need to drink here and there between meals.

Good luck with your new pet and Congrats on finding your white knee

Krawll