I have my humidity a bit different. It can depend alot on where you live and the current season as well as the machine- but for hatching I get mine up to aroound 80% For the first 25 days I go for around 50 % . Temp is 99 - 99.5 in my bator.
I have done chicken and ducks together, I had it at the higher humidity- the chicks were fine but just took a long time to dry out and fluff up. I watch the size of the aircell during incubation as much as the actual reading for humidity.