Have you used more than one meter to check the humidity? If you have water in it and you are getting a 45% humidity and you add more water surface---not depth and it still reads 45% something is wrong with that meter. Every incubator I got I can range from what the humidity is without water to 85 to 90%, I have done more than 90%---the chicks that hatched never dried off till I took them out.
I have 2 and both read about the same. I have gotten it up but then the temps drop. I might add another vaporizer. I have a fogger and a vaporizer now and a fan to circulate it UP. This is NOT your normal hatcher. This a custom made hatcher and is HUGE!
That wall is about 12 feet long.
That is what the drawers look like inside. Hardware cloth so that air can circulate.
That bottom is where all the heat and water are. I have a fan and a pan of water (15 x 10 with a fogger and a vicks vaporizer both run out of water over night. I can fill it 2x's a day) Then I have my ceramic heater. Fogger and vaporizer run ALL the time. The heater is on a thermostat. I just don't have any other ideas how to UP the humidity. I have used towels to wick the water and they just dry out.
I am DOUBTFUL about the puppy pads. I feel they will dry out too quickly.
They hatch well even at 45% but I would like to get it up a little higher.