You could bump your hot spot up a little bit to about 92-93.
My baby ball acts the same way, he's pretty adventerous a lot of the time, and will also lay on top of his hide and go to sleep randomly, and try to climb to the top of his tank and try and push his way out.
I think if he's eating, then he's probably comfortable, so he probably isn't that stressed.
I do notice also, like you did, if it's dark in the room, he'll also come out during the afternoon and explore a little bit, get a drink, and wander around. So I also started giving a little more natural light into the room, and now he's only super active mainly when it's really dark.