Your new buddy is going to "surf" the glass a bit. If he is doing it during the day he is stressed. If he does it at night its normal as thats the time they explore. Mine get up 8/9pm till 2/3am.
Everything sounds ok buy you need a Dimmer Switch and a thermometer to see what your floor "HOT SPOT"'is. The Heat Mats get up to 140 and you can cook a snake. I know the ZooMed ones say to only run them Regulated. You can buy a "Jump Start Thermostat" on Amazon or a Dimmer switch at Lowes to control the Heat Mat and get a Probe thermometer to get your Hot Spot temp. You can even find a Laser at Pets Mart to check the surface in your tank.
Check the "setup a Glass enclosure thread" and also read about all the products people use and recommend.
Heres a Dimmer - https://m.lowes.com/pd/Lutron-Creden...Dimmer/4462373