It's interesting how he goes around the same basic track every time, doing the same things! Like he is beating out a path for himself. Also looks like he could use a nice dark hide. Just cut a "door" into a dark colored plastic bowl and sink it half way into the substrate. He looks healthy if slightly pyramided to me. Quite energetic!
Spraying doesn't work, as you have seen. They need to be in a closed chamber so your heat and humidity isn't escaping out and into the room. Keeping the substrate damp helps too. You have to dump water into it, not just spray the surface. How much water to dump and how often will vary tremendously from enclosure to enclosure. Do it by feel. You want it damp, but not sopping wet all the time. I frequently dump the water bowl into the substrate (if there is no poop in it), wipe it out, rinse it and then refill it sloppily. All that extra water is usually enough to keep the substrate damp. Some open enclosures need more. In my outdoor heated night boxes with substrate, I set my hose to "gentle shower" and spray the inside of the box for 20-30 seconds to saturate it here in my dry climate.
Humidifiers should not be used over tortoises. Its not good for them to be breathing those little water micro droplets, and this is not the same as humidity. You don't need a humidifier if your enclosure is set up correctly.
You could try putting some small amounts of food (e.g. on slate) in different parts of the enclosure so that he can graze as he's wandering. My tort tends to stick to the same path when he's outside in the summer.
