How do I make it wetter?
You might need to change out your substrate for something that doesn't have such big pieces. Then you keep the substrate moist. You can pour some water on it and mix it in. That plus the heat will create the humidity you need. Your enclosure is completely covered, right?
You may not be able to notice the signs of fighting. Bullying in tortoises can occur without you ever noticing it. If you see them cuddling, that isn't a sign of affection. One of them is trying to push the other one out of the way. If one of them isn't eating and the other one is, it is most likely due to the tort feeling uncomfortable and unsafe.