I've noticed that Cheerio has slight pyramiding, and that he needs to have more humidity in his enclosure, any suggestions on what I can put in there to make it more humid?
I do not have any sulcatas but I've heard Tom say that once his reach that size they move outside and he doesn't keep them in anything humid anymore. IMO I wouldn't be concerned about a humid environment rather I'd be trying to find a way to give him a very large outdoor enclosure.
If you still want to try and have a humid area for him you could try a large humid hide or a humidifier for his enclosure.
At that size what they have is pretty much what they are going to end up with. However, I believe Tom does put water jugs in his night boxes for some humidity. You can look up his night box thread and see them in there.