This is my fourth hatch, I am using my own marans eggs I have had low hatch rates about 30% on average except one was o% . My last two hatches I broke the eggs open on day 24 and all but one were fully formed inside and had absorbed the yolk but never pipped . The humidity was allways okay and the chicks membranes weren't dried out. I know my bater is not great it's a covina stillair ( similer to an LG I think) but why are they dieing at this late stage ? any ideas ?