Ugh, sorry about having to retype so much. I stick to my computer for the most part as the mobile devices I can use, but I'm usually a clutz on.Hello Debbie, Thank you for the info.
I had almost a book typed out to you and the screen flashed and I lost it….lol. I hope this is not how my whole day ends up.. Although it’s probably better for you….
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I’ve done a brain exploding amount of research on this forum overnight. A great thread from a gentleman named Pete on shipped duck eggs.
My eggs will go into the incubator at 4pm (24hrs) this afternoon in cut down cardboard egg cartons. Not be touched for 3 days. Then left in carton cut out for additional 4 days but turned from side to side. I know I have a 50% air sac detachment in my eggs. Meaning 50% or more air sacs are detached.
My question is with humidity. You said 40%. Mine are preset to 60. And my last and first incubation I could never get it under 50%. Not sure if our heating with natural gas has anything to do with this or not. My house stays at 50 to 60% humidity in the winter months due to heating with natural gas.
My back up incubator was inherited from my neighbor. New in the box but an Amazon cheapie. It’s set at 60% and is running 70%. Was planning to use it if I had to keep any of the eggs in an upright position longer than the 7 days. Any advice on how to get the humidity lower or closer to 40%? Took the water bottle out of the newest unit and it has dropped to 64%. But not sure if I can stabilize it without the water bottle in. I can see to many things that may go wrong.
Thanks in advance for any info or if you can see from my plans what I need to do different. Any and all advice is more than welcome,
You're doing great reading articles and threads on here!

Are you incubating duck eggs or chicken eggs? Usually, there's no difference, but with some breeds, there is.
Your house running high humidity: We are in Wisconsin which averages 70% humidity and is as bad in the winter as it is in the summer, and yet, inside right now it's 27%.

There should be a way to change the preset on the incubator. Try looking it up to see if you can find a manual or tell us the brand, and maybe someone knows of it, or I can try to look it up for you.
If the eggs run high humidity the whole incubation, they may drown. Perhaps you can find a bedroom or another place to set it where it would be less humid? I'd remove any humidity sources from the room, such as pet dishes and potted plants.
I do 40-45%, but if you can get it down to 50%, that's still okay. 60 or 70% is not good during incubation, that's for lockdown (the last three days). I see you did pull the water bottle from it. Is there a water receptacle in there or a sponge you could remove?