Nice basic set up. I just have a couple notes. Don't take your temperature readings on top of the substrate (paper towel). Take them on the bottom of the tub right above the UTH. You want to know the highest temp your snake has access to. If it's 90F on top of the paper towel, it's probably warmer underneath it. Also, be patient when assessing your temperature and humidity adjustments. It'll take days, not hours, to know how effective your adjustments are.