I am trying to do the dry incubation method and it seems to be an all or nothing situation. I got up this morning and the humidity was 24%. I added 2 ounces of water and it jumped up to 60%. I have a medium sized black plastic TV dinner tray (the lean cuisine size) that my water supply tube runs into. I am wondering why it is either too high or too low. Any ideas why and what to do? Vents are open.