Commercial hatcheries are operating an entirely different incubator from the one your using and hatching thousands of eggs versus the hobbist hatching a few with a Styrofoam bator.
Depending on what type of eggs your hatching will determine what % RH you choose to run your humidity. Also, the ambient humidity in your locality will determine the amount of water you have to add or not add to operate the humidity at 35 to 45% RH. Surface area is more important than the amount of water used. Larger the surface area the greater amount of humidity will occur and vice versa.
Most hobbist operate their bators at 35 to 45% RH for the first 18 days, (for chicken eggs) then increase the humidity for the last 3 days of incubation (lockdown) to 60 - 65% RH. I don't like that term so I try not to use it....as far as I'm concern it's just part of the whole incubation process.
Too high a % humidity at hatching time can cause problems too, such as 'stuck' chicks, which can lead to other complications, like curled toes, due to the fact it takes a chick too long to get out of the shell. Also, could cause the chick to drown, if it pips into the internal membrane and moisture has accumulated during the incubation process.
Everyone has given you some good advice. Follow their advice and the next hatch should be successful.
