I have a very old incubator ("Little Giant Still-Air Incubator) with none of the new conveniences. Except for auto turning. I have three little "trays" for water, but I have no idea what the humidity is!! This is my first time hatching ducklings, and all of the half hatched ducklings appear to be shrink wrapped! Should I hatch them out? I've done this many, many times due to my darned 'bator, so I'm getting pretty good at it. Is there anything I should know? Should I wait?