Yeah the accurite sounds like its got to be off I can't see the humidity going down with misting. One reason for the temp swings is probably your ambient room temps 70 is low youll have to raise the room temp to get your tub ambient up. Id just keep checking my temps over and over. Best thing to do if possible is to move him back to his original enclosure if it was maintaining good numbers. That way you can get your new tub dialed in. Its good to run new enclosure, racks etc a week or two to get temps and humidity dialed in.