first hello everyone. I am new on here but not to owning birds. I have a flock of 19 RIRs and 6 guineas. i always bought chicks already hatched, never hatched my own. so any help or insight is appreciated. i have a hova 1602 forced air. 76% humidity 99.5 degrees F. they started to pip/hatch on day 20. out of 23 eggs 4 have died. all fully formed and piped some zipped. right now 2 are part way out peeping strong about 6 hours now. 7 are totally out and fine. 12 not pipped at all. Is this normal? or am i doing something wrong? i would post pics but since i'm new on here it won't let me. i can email to someone if you would like.