Humidity is one of those things that there are basiclly 2 sides to , 50% ish is the typical , read about just about everywhere. And if your hatching eggs for the first time there is no problem with this , altitude and local humidity play a roll. But you wont really know what will work for you or your bator unless you do a few hatches , keep notes in a notebook and tell us about your hatch and get feed back and all that . I find that I seem to get better hatches especally in my brinsea mini eco if I use less water and have a bit lower humidity. You should keep carefull notes of your humidity a couple times a day every day and then eggtopsy the eggs that dont hatch ( if there are any some times you get lucky
) and find out if your chicks are badly effected by to low or to high of a humidity then you will know at least for you at that time of year and that bator what you should do , dry hatch or normal hatch.
This is just my opnion on the TWO sides to humidity in hatching. Everyone I am sure will have there own ideas and thoughts.
What kind of incubator are you useing? What kind of eggs? Im just always curious about new hatches