I use a farm innovators 2400 Styrofoam model as well. Mine is still air, my temp is at 99.5 and i run my humidity at 45-50% for he first 18 days and up to 65% for lockdown. I have had 3 successful hatches already this spring and my 4th hatch goes on lockdown friday. My hatch rates have been incredible. I called the manufacturer and asked what their specs were when they ran their test hatches, and those are the numbers I go by. It seems everyone has their own opinion about humidity but there are variables - location, temperature, or where your incubator is placed you just have to find what works for you.
Good luck
Good luck