Have you candled your eggs to see what your air cells look like? For me that is a little high for days 1-17; I like mine at 25%-35%. But if you are not adding water there is not a lot you can do about it. I would make sure that your hygrometer is correct. If it is and your air cells look small, you could try adding a cup of dry rice or dry sponges to pull some of that humidity out of the air. You could also try to put in a room with a dehumidifier if you have one. Regardless though of what your hygrometer says, your best bet is to go with what your air cells are telling you. For lock down I would still raise your humidity. At that point they do need the higher humidity so the membranes do not dry out. I usually raise mine to about 75%. If your air cells do end up being small, once you stop turning your eggs and get ready for lock down maybe consider hatching in an egg carton with the air cells upwards. There was a post on here not too long back about hatching in Hawaii and they were having the same issues. You might try searching that thread out.
