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That really sounds a fair bit on the high side to me. Maybe you have had good hatches with those humidities, and if so, congratulations, but you should know that you are in a minority. A good starting humidity for newbies with no previous hatching experience is more like 30-45% for the first 18 days. I would recommend that first, and I would only recommend a higher humidity to someone who had tried out 30-45% with a previous hatch and had found it to be too low.
More people over-humidify eggs than under-humidify them, and it's one of the most common incubating mistakes made. Especially with still air incubators, which seem to need much less humidity than fan assisted bators. I'm not sure if the Hova Genesis always comes with a fan or not... If it doesn't have a fan, I'd say go for a lower humidity, say 30-40%. If it does have a fan, maybe go a bit higher, something like 40-45%.
Good luck. And yes, get that hygrometer. And make sure you calibrate it before use, cause they're not always accurate!
Yes, absolutely.
I need to look for that egg air sac chart I keep forgetting where I saved it to. Stick it on my BYC page or something. Do you have one on your computer gypsy? Its that time of year again (hatching), seems like I am constantly running into these posts.