I have some runner duck eggs in my hovabator 1588. They have started to pip on day 25. Is this too early? The temp is supposed to be preset and it said not to adjust it until after your first hatch. The thermometer that came with it is reading 100. The hatch before this came on day 26. I only got 4 out of 12. The rest were fully developed but didn't even pip. I have another dozen I would like to put in when these are done and would like to know how I could improve my hatch rate. Thanks for any help.