How hard is this supposed to be?

Looks like you have a few problems to iron out before your next hatch. Have you read all of Hatching eggs 101 in the learning center? It's full of lots of helpful info. Can you put the bator somewhere where your toddler can't access it? Calibrate your thermometers to 100*. Try dry incubation, which is not really dry. It's lower humidity through day 18 to manage air cell size. I aim for 25 - 35%, but the entire purpose of this is to keep the air cells the right size so the chicks are not too big and wet at hatch (which I think is part of your problem). You need to spend a couple of days with the incubator running, without eggs to get your temp fine tuned. (I like to put some sealed bottles of water in the bator during this time, for thermal mass to = the volume of eggs I'll be setting. Those knobs are a pain, that's for sure. Some folks glue a milk cap onto the knob to make it easier to get that ever so tiny amount of turn to get the temp right. Is the room temp stable? Many incubators can't hold steady temp unless room temp holds steady around 70*. And finally, even after you have everything stabalized and commit eggs, you can expect your temp to drop in the first 24 hours. DON'T TOUCH THAT DIAL! (unless you get a temp spike that lasts for more than an hour or goes above 103!) Then, as the eggs start growing, they'll produce more of their own heat, and you may need to turn the temp down a bit. I find I need to adjust a bit around day 7, and day 14. But, I'm always on the look out for temp creep. Finally, where are you testing your temp? At the top of the eggs, and checking throughout all quadrants of the bator? You need to know where your hot and cool spots are before eggs go in.

 

Like LG said, some people have glued big buttons or even Legos to the adjustment knob to make it easier to turn it in small increments.

I follow this chart, and adjust the humidity up or down depending on the air cell size at day 7, 14 & 18. If it's too small, lower the humidity. If it's growing too fast, raise the humidity.




It's not "hard", you just need to have accurate measurements and let the air cell tell you what adjustments to make.

 

I'd add that it is most important to calibrate both temperature and humidity. They are not always correct. My hygrometers were 15 points off...lol!

It's super easy to do the ice water and salt calibrations.
I think it's in the hatching 101.