Hatching Dark Eggs

I know this is an older post but the information is interesting/ helpful nonetheless. I dry incubate (no additional humidity added) for the first 18 days then increase to 65% humidity for the final 3 days. I find that natural humidity stays between 25-30% in my area. Also, I do not candle during the first 18 days primarily because I cannot see thru the dark eggs. I usually an 80-85% hatch rate.