Hi all, First time hatcher here. I have a DIY incubator (plastic bin style) with 30 eggs set. I am showing very good development in them as of day 7. Active shadows and nice dark eye marks, good veining. But only a few with obvious air cells. I'm a tad worried. And ideas? Incubator has a PC fan, temp is 99.3-99.7 and humidity between 40%-50%. Should I drop the humidity and check again at day 10 to see if we have better luck? Thanks!