Get a planet waves humidifier and a small hygrometer for inside the case. Your humidity should be between 40 to 45%. When you say around 35% that’s a give or take and when you get closer to 30% bad things happen. There is a lot of force pulling across the top when it starts to dry out and the best thing for you to do is get some small cups, (disposable) and cut them down to about 1 to 1 1/2 inches tall. Place some wet sponge in the bottom of the cups and place them in the guitar. Two or three will do and bag off the body of the guitar and tie it off at the neck. This should be flat on it's back and then call the builder so he can cleat the area and address other things that may be going on. It will take a couple of days for it to even start to close up depending on how bad it is.
Once ebony has shrunk it does not go back like rosewood. The fret ends will have to be dressed down.
Don't trust a home-made sponge in a bag thing, get the right stuff for your guitar.
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