Not a good way to add humidity, spraying the eggs will cool them...and not maintain the humidity..also 50-60 may be a bit high.Currently I have a spray bottle and I lift the lid and mist it on each side quickly so as to not release the heat.
Here's some really good info to read:
https://www.backyardchickens.com/ar...incubator-thermometers-and-hygrometers.73634/
https://www.backyardchickens.com/articles/the-beginners-guide-to-incubation.73350/
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/
https://www.backyardchickens.com/articles/incubation-humidity.73386/