Yes, I believe your probes are fine. If you're really, really paranoid about the temps, you could always get another thermometer and put a probe beneath the newspaper, just above the heating pad...so you can measure the exact floor temp as well as the temperature inside the warm hide. Seriously though, it looks like you've got your setup going just fine. Even after you've had your snake for awhile, you'll still be tweaking and playing with it. I think we all do.

Like others have said, using carpet isn't a good idea. In addition to being uncomfortable for the scales, it would also be a real pain to clean. You could look into the "repti-carpet" or "astro-turf"-like stuff from the hardware store. That is easier on the scales...easier to clean, and relatively inexpensive. Keep two or three pieces of it around so that when you pull out a soiled piece, you have a fresh clean one to replace it with...then clean the dirty one really well and set it aside for the next time you need to swap them out. I believe they are less inclined to try and hide under the carpet than they are newspaper...but there's never any guarantees. Your little guy will go where he wants to and you won't know for sure until you get him...so just be ready to make the necessary adjustments as you go.