Half of our eggs are too thick to candle, especially the easter eggers (blue and green). This is our 4th incubating and hatching, and I have yet to have one explode, but there is an objectionable odor that develops from the bad eggs. I don't want to risk throwing out a good fertile egg. What is the longest an egg should be waited on to hatch before you give up? Does anyone else have this problem and what do you do? I candle at the 7 day mark and could tell fertile ones and clear ones, but others there was no way to tell, including today which is day 16.