I have two Yellow Foots (They say they need more humidity than red foots). I live in a very dry house - people around often comment how dry the air is. All I do is keep my yellow foots on moist sand (How you would keep a pot plant) and have a wading pool.
About temperature - I have my temperature set to 75 during the day and 68 at night. I have noticed this is much lower than most people report. I find if it climbs much higher than 75 my little guys try to escape - if given a chance they will hide in a cool dark place (around 70 degrees). My Torts have no pyramiding - but more a slight depression on their shells.
Low humidity in their box is around 40% (House gets down to 10%).
I try to wash my torts every day (Use to soak but find washing is just as good) and mist them with a water spray as often as I can.