Yard mix hatch along

[waw]

This is the second time I have ever incubated chicken eggs in my lg bator.
Last time I had a temp spike and every one of them died at about day 15 this time I got better equipment and one of those egg thermometers that is really accurate I have come to conclude
I have set them today at a standing temp of 99.6 for the last six hours it is a still air model
I have just set eggs
About 22 eggs and would like advice along with others trying to hatch around the same time also I was wondering if I could leave my eggs in the turner or something of the sorts because the temp from there current position and there is about 2-3 degree variation

 

[waw]

Today is day 3 of incubation
My temp was 73.7 this morning and tonight it was 101.1
farenhight of course
Can some one please tell me if they should be okay

Also no candling cause family all say that's what is killing them but I only candle on days 4,7,14,18. They say that is killing them even though all of them are developing fully just not hatching some times one or two will break thru the inner membrane so what can I tell them so they will understand that candling is okay.

The reason on 4 and 7 because some are dark shell and some aren't I only candle light on 4 and dark on 7