My chicken eggs were doing great till the end of incubation, I candled and found about 10% with nothing, and the others dark at day 15, and then on day 20- 5 hatched. Another two were still alive with pipping but died trying to hatch, another made it out and died shortly after but its wing and beak were deformed, so I assume nature took that one, and on day 23, I cracked one open and there was a baby chick fully developed but dead, I am afraid the other 2 dozen eggs will be the same way. the heat fluctuates between 99-101, and I have humidity set at about 60%. Yesterday there was a really bad heat wave and the humidity dropped to about 30% and I added water asap that was brought up to 100 degrees. What should I do? I have an old teakwood sears and Roubuck incubator with no auto turners, and turn them 3-4 times a day. I constanly check temp and humidity, it has ventilation fan above the water trays and that is were the heating element is too. When I use my little styrophoam one, it usually hatches better percentages, if I have 20 in there about 60% hatch, this one does not have a good percentage yet- but maybe I am doing something wrong??