I have read several times that you can judge how to adjust your humidity by monitering the size of the air-sacks at various times during the hatch. However, I cannot find pictures or specific information about "correct" size of the sacks at various stages of development. My eggs are on day 10 and I could still have time to make adjustments if I knew how to judge what I am looking at! None of the egg candling picture pages that I have found address this. FRUSTRATED. I get that humidity to low= air sack to big, To high= air sack to small. I need pictures or description of ratio ideals!