This is my first hatch, it is the beginning of day 23 and no one has pipped (internally or externally). I have candled the eggs (following the directions of Step by Step Guide to Assisted Hatching) and I see movement but hear no chirping. When do I need to assist them? I have a Little Giant still air incubator and have kept the temp. around 101.5 and the humidity around 48 (Its as high as I can keep it). Thanks in advance.