I am wondering if any of the frequent hatchers can use their experience to answer a fairly general question. I just candled 36 shipped eggs (7 days). All but 4 showed every sign of being a "good" egg, with veins and all. Assuming I have no issues with temp, turning humidity, what % of those eggs should I expect to hatch? In other words is the first candling the most crucial? I know lots of things can still go wrong but the incubator has been right on the money with temp so that should be OK. Whatta ya think?