There is a sharp learning curve when it comes to incubating, and everyone goes through what you are describing, I could give an "amen" to every one of yours, plus add in crippled chicks from wrong temps and humidity, putting the brooder where I thought a dog could NEVER reach it, having one drown in the waterer, prolapsed intestines at three days old, pulling them out of the shell too soon, dropping an incubator full of eggs three feet onto the floor while trying to move it with a hurt wrist, faulty turner not working and wasting another incubator full, temp spikes up to 108 killing another bator full, you name it, I done it... you are in good company. Keep on trying and you will figure it out.
Patty