A) Please unplug your UTH until you get a thermostat. You're risking serious burns or worse to your snake by operating any heat source without a thermostat. Your UTH is there strictly to provide a hot spot and isn't there to affect the ambient temps. Your CHE should also be on a tstat. This is what will provide your ambient heat temps.
B) I suggest getting rid of the half log hide and replacing it with something with only one opening. BPs like tight, secure, dark, safe places. Those log hides provide none of that.
C) I would get a temp gun so you can get your surface temp right once your tstat is set up. That means the temp of the glass above the UTH. This should be about 90-92.
D) Your cool side temps are a bit low. 75 should be the absolute low, but you're better off staying in the 78-82 range.
E) I would wait until a week after her last meal to feed. You should have gotten this info when you purchased the snake.
F) I would wait until she has at least 2 or 3 meals in her before doing much handling. Minimal handling for enclosure maintenance is ok, but the less the better until she's eating regularly. You'll have this snake for 20+ years if raised properly, so you'll have plenty of time to handle your snake. Let her settle in an get eating, her health should be priority number one.
G) You definitely shouldn't need to add a second CHE. CHEs will make humidity harder to maintain, two would make humidity control a nightmare.
H) What is your humidity? How are you measuring it?