this is the method i used this season - I had 10 clutches in the incubator and NOT a SINGLE egg/baby died out of more or less 60 eggs .. first of all I wash all the egg boxes and egg crates with regular liquid soap used for washing hands (it is very effective for killing bacteria).. i put vermiculite in the box - don't know how much but alot of it, over 2 inches .. i SOAK it with water .. it almost seems like a pool of water (too much humidity can't hurt the eggs) .. on top of vermiculite I put the plastic egg crate so that none of the eggs are touching the vermiculite .. i don't put any holes in the egg box .. I put press and seal over the top and seal it completely so that there is no air circulation at all .. the humidity is therefore pretty much 100%, condensation is CONSTANT from day 1 to the end .. I open the egg boxes once a week and wipe off the water drops from the press and seal and then put it back on
now for the incubator itself .. it is an old beer cooler .. it has a fan on the top AND bottom to circulate the air in the incubator 24/7 .. I measure temperatures OUTSIDE of the egg box, the temperature i use 24/7 is 87 - however this is temperature OUTSIDE of the egg box, which makes me believe that the temperature INSIDE the egg box is a little higher, however I have never measured it
I cut all my eggs anywhere from day 52 to day 58, depending on how excited I am about the particular clutch .. on day 59-61 I see first heads out of the eggs - it has been like this for all 10 clutches
this is MY method and so far the success rate from 60 eggs has been 100% - no dead eggs, no dead babies, no twisted umbilical cords etc.

regards, Andrej from ABpythons