The probe needs to be outside the tank- underneath & sandwiched between the UTH & glass, and THEN you make adjustments to the thermostat to achieve the temperatures you need INSIDE the tank (over the UTH) & which you verify independently (you don't take the t-stat's "word" for it- you need to check what is actually achieved because that is what's important, not the actual t-stat setting).
Inside as it is now, the probe can (WILL) get pulled* out of position or have water spilled on it, which will cause it to mis-read & overheat the tank- it's not safe this way.
*Snakes find everything around them that provides traction- wires WILL get pulled on, & your tape will soften from the heat & let go. After that, the tape can stick to your snake & get "hot-glued" in place when he stays over the UTH- causing injury & harm to his scales. NO tape belongs inside ANY enclosure with snakes- ever.
You need to fix the UTH heat & t-stat first, then we'll talk about your humidity. (This sort of substrate helps hold humidity, & a humid hide can help also; if you have room for a larger water bowl, that will help humidity too, especially when it's on the warm side. But the biggest thing to raise humidity is to restrict the air-flow- ie. you'll need to cover most -not quite all- of the screen top with anything air can't flow thru- because heat rises up & out, taking the humidity with it.)
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