Sorry they are having such a rough time. I would be thinking egg quality rather than anything that is incubator related. Plain old weak chicks. This is the second hatch I have read about in the last 4 days just like this. Your post showed up just as the last one I was reading was wrapping up. I stand humbly corrected about your experience and since that something was wrong. In fact it seems to me you have a very acute and tuned since when it comes to hatching eggs. You where alerted to something long before I would even have been concerned. I am still convinced these chicks have had about as good a care as they could get. Sometimes nature is just not going to play fair. All the experience in the world is not going to change the fact that some chicks just do not get what they need to survive. whether it is adequate nutrition, a good set of genes, or even a shell that is just to thick. it is natures way of keeping things working. I hope to be setting some fairly expensive eggs ($50 a dozen) in the future, and to be honest I would be a lot more comfortable with someone like you looking over my shoulder.