Have you double checked that your hygrometer is reading correctly? Creating more surface area of water will help raise the humidity. Adding wet sponges or wet cloth to the incubator should bump it up. It's not the depth of water that creates humidity but the surface area.
I got a big Pyrex dish in the bottom with two car wash sponges in it. It was in the 30s at one time but those sponges won't suck water back into em. I bought thinner sponges maybe they will hold water better??
Chances are you humidity gauge is not reading correctly, to put your 16% humidity in perspective the Sahara desert averages 25% humidity... 16% is beyond dry and unlikely true if you have bowl of water and sponges in there...
So yeah 5 feet tall is a big issue considering you have to get the whole container humidity up. My guess without any pictures you would have to put a bigger water source with many more sponges and i mean many especially if its vented
Have you verified your humidity gauge is correct and accurate? Using two known good and calibrated humidity gauges does humidity vary from the bottom to the top of the incubator and/or right next to the bowl of water?
What is the ambient humidity and temperature in the room the incubator sits in? Edited by MeepBeep - 5/16/16 at 8:45pm