I am new to all of this,and I need some advice. I have hatched 4 batches of eggs in the incubator. I get chicks every time but my hatch rates are not good. I keep my humidity about 40% and then bump it to about 70% for lockdown. I keep getting fully developed chicks that aren't hatching. They make it to lockdown, and I see movement. I candle each egg as they move to the hatcher. When its time to hatch though I am losing chicks. Some never pip and some do. I tested my hygrometer using the salt test. It is accurate. When I open the eggs they are fully developed with the yolk sac absorbed. The membrane looks good on most of them when I open them up. I wait until day 25 to start opening eggs. Any advice or something different to try?