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that's the thing.. there is no "magic number" for humidity during incubation since it can vary from home to home .. even from room to room in your house. Things like water features (fountains, showers, fish tanks), if you have windows open, weather, heaters, and so on can affect it.. not to mention the incubator itself (fan placement and force of air across the eggs).. and then there is also shell porosity.. which can vary from bird to bird
So yeah.. that's why I always say to let the eggs be your guide as to what the humidity should be for that particular hatch in your home and in your incubator...
Can you use a brighter light?.. I use the super bright led flashlights and they work great for air cell viewing as well as embryo development.. for eggs that i can't see into (some marans and emu for example) I just go ahead and weigh the eggs on day 1 and monitor weight loss