Hi PeepCA, To reply to your questions, yes there are circulation holes to let out air at the top. They also have been helping me maintain temps. The temps I have are for the bottom of the egg. The ones before were at the top. Yes I'm worried enough too! The candled eggs have different sizes of air sacs. They had been at the top and growing. Now they are pretty large and slanting down one side, esp in the more developed eggs. I will try to candle some to show you what I'm seeing. I could be incubating all dead keets for all I know. I feel so awful and sick sometimes and wish I knew more. I do have the humidity up in the 70% range right now. So thank you VERY much in that department. Let me go and get some photos and I'll write back soon. I so appreciate this PeepsCAHmmm... I'm not exactly sure of your set up (so the pics will help a lot) but I have a couple concerns for your eggs...
Do you have any ventilation holes that can draw air in (from the bottom) and let out air and gasses (at the top)? That may help circulate/distribute the humidity better. The little fan you mentioned should have been running all the time (not blowing directly on the eggs tho) to circulate the air, heat and humidity more evenly if you have been keeping the temp in the 99.4-100.4 range, otherwise you've needed to run the temp a little higher (in the 101.5-102 range) because without the fan you're basically still air incubating the eggs... and without the air being circulated, warm air rises so the temp will be lower at the bottom of the egg, not maintaining 99.5 at the center of the egg where the yolk and developing keet are located.
I know you've already been stressing about this hatch as it is and I don't mean to stress you out any more, but if this is the situation with your temp and air circulation... then your hatch will probably be late and you may have keets with hatching and leg issuesDid you candle the eggs and look for the air cells starting to get larger and slanted? That usually helps me determine the lock-down day better than the calender does.