Great job.. But one of the most important things is a Tstat. A "Jumpstart thermistat" on amazon is $28 and you cant go without it. Your going to have this snake up to 20 years if you do this right... A UTH is a great heat source considering if all else fails the snake can lay on the uth and be 100% good. I used one alone for 20 years back in the 1990's..
For the CHE on the Cool side LOWES sells a Dimmer cord (looks like extenion cord with dimmer switch) And its only $14.95. You can use that to tune down the CHE if you need to but first things is first, get the UTH a tstat asap. You cant be wondering 24/7 if the snakes cooking or not..
https://www.amazon.com/Hydrofarm-MTP.../dp/B000NZZG3S
Dimmer : https://m.lowes.com/pd/Lutron-Creden...Dimmer/4462387