I have the Little Giant with the egg turner.
With mine I had tried three different changes. My first change was different was of humidity control. That didn't work.
My second was the fan, that helped but still no hatch.
My third change actually consisted of a few things. They were random ideas but they worked.
These changes were, one I took the egg turner out, and retried the different was of humidity control. That was putting a a bowl of water under the incubator itself where the vent holes are. I found this is only needed during hatching time. And finally I covered the top piece with duct tape. I now have development in my 5 eggs. This is the first ever with the three different tries. So I figure it is working.
One week for two eggs and two weeks for the other three.
I'll let you know if anything hatches.
Nice effort! Do make sure the 8 holes the size of a pencil are open. The little chicks need more oxygen at the end of the hatch, during the lockdown phase and especially at hatch.
DO you watch the increasing size of the aircell?? This is the key to humidity levels.
Diagrams of air cells, duck and chicken:
http://www.poultryconnection.com/quackers/aircell.html
A good read.
Incubation Cheat Sheet - BackYard Chickens Community