Bump his heat up to 95-96 on the hot side and 86-87 on the cool side, and also make it very humid(not wet). This will help until you can get to the vet.

Is the snake in a tank? If so, you're just working against yourself. Get a small tub, put the UTH on, and possibly cover the whole tub in an electrical heating blanket, or get a room heater.

Also, Balls don't need soaked UNLESS they are having a poor shed. Soaking them any other time just dries their skin out and predisposes them to having bad sheds, like how we get wrinkly when swimming.