I definitely would not run anything dry this time of year, not until May or June when the humidity has gone up considerably to 40-something percent. I consistently have a 95% hatch rate and I hatched 60+ chicks last year with domestic Brinseas, but not adding water this time of year would have a very serious effect.
Do you have a good thermometer & hygrometer? The readouts on the Brinseas can be up to 2C off for temperature. I use 2 Brinseas, both with good quality thermometers and hygrometers (just bought off Amazon), and IF the temperature and humidity are correct they are brilliant.
So what are you planning on hatching?