I just read a post on the Turkey Hatch thread that explains what can happen when humidity goes to high in the incubator. The higher the humidity the more oxygen is removed from the incubator, leaving Carbon dioxide. What appears to be drowning with too much humidity is actually CO2 poisoning! So, going over 80% will not drown them but will kill them because of a lack of oxygen\co2 poisoning. Keep those vents open and make sure there is plenty of fresh air around the incubator.