Is the circulated air a problem in a hatcher?

I have 4 Genesis 1588 incubators...for the past several years I have had very bad luck during the lockdown with chicks dying in the shell the last 3 days.

Just recently I was told by someone that he puts his eggs in covered containers with air holes drilled in the sides (he has circulated air but not a Genesis 1588) he has found that he has better hatches when he keeps the circulated air from hitting his eggs.

Well guess what? I have gone from 40 to 50% hatches to 90% because I am doing the same thing.

I am now planning to buy the 1602N to use for hatching.

I emailed the company that makes these and was told I shouldnt have a problem and perhaps I need to adjust my humidity lower.

I still do not think that is the problem.My humidity is 60 to 70%. I have always felt that anything lower is not a good thing for my hatches.