Ok Tom I Have Read The String... I See A Couple Things Here
Still Or Forced Air?
What Type Of Air Flow Do You Have In The Bator? 24 Silkies Will Not Require The Amount Of Oxygen 120 Quail Will.... So That Could Be A Source Of Your Low Hatch. Also Anytime You Smell A Bad Egg--- Hunt It Down Vigorously And Remove Asap--- Even If You Have To Break Lockdown To Do So--- That Rotten Eggs Smell? Its Sulfure Dioxide Gas, A Byproduct Of Decomposition, Its An Asphyxiant--- It Competes With Oxygen In An Enclosed Space And Can Literally Suffocate The Embryos.
Never Discount The Shipped Egg Theory--- You Have No Idea What/ Where/ How Those Eggs Were Treated Or Even How Old They Are At Time Of Setting. So There's Alot Of Wiggle Room Here For Difficulties/ Low Hatch Rate
Humidity--- (sorry Alexandra I Have To Respectfully Disagree With You Here Kiddo..) Humidity Is Critical With Most Gamebird Speces The 50+% During Incubation Is Fine, But I Never Hatch In Forced Air #1, And Never Use Anything Less Than 65% Humidity For Lockdown #2--- In Fact I Use Ultra High Humidity For Hatching (only Possible With Upright Hatching- See Next Paragraph)
Here's A Big Bonus--- Always Set Your Eggs Upright For Hatch. I Dont Care If You Use Paper Egg Flats, Old Egg Cartons In Either Paper Or Styrofoam, Duct Tape Them To The Bator Walls, Build Some Wild Contraption, Hang Them Upright From The Heating Element, Or Just Un Plug The Auto Turner And Leave Them In It--- Set Them Upright For Hatch And You Will See A Readily Appreciable Increase (20+% In Many Cases) In Your Sucessful Hatch Rate--- Your Mystery Deaths(as Well As Many That Didnt Pip Thru The Shell, But Did Manage To Break The Inner Membranes)? Likely Drowned In Their Own Amniotic Fluid--- Very Very Common In Gamebirds, Also Almost Impossible If They Are Upright Because This Allows Those Fluids To Escape Without Blocking Jr's Air Source --- And If Jr Cant Inhale Liquid Then He Cant Drown
This Method Even Works With Your Upside Down Pippers!
Lastly--- What Is Your Bator Made Of? (what Type Of Wood?) As The Pix I See It Looks Sucpiciously Like Cedar? If So Junk It For Gamebirds---- Cedar Gives Off Toxic Fumes To Quail And Does So More Readily With Added Heat And Humidity Of Incubation--- It Makes Great Humidors For Cigars, But Lowsy Incubators For Quail
I Cant Tell You For Sure What Part If Any Or All Of These May Have Had In Your Results--- Just Observations And Suggestions. Ultimately With Patience, Observation, And Experience You'll Develope Your Own Incubation Style/ Techniques That Yeild The Best Rates For You.... As Hatching Is An Artform We All Develope Thru Experience.