Incubating Turkey Eggs

Hi All,
I had 4 turkey eggs that were due to hatch on July 6th. On the 3rd when they were locked down, there was movement in all 4 eggs. I finally gave in on July 9th and did "eggtopsies" on all 4. Poults seemed fully developed with egg sack showing on outside. The membrane was wrinkly, tough and almost a leathery consistency. Was this caused by a humidity problem? I do not have a wet thermometer and have been following the incubator instructions, added water to the second tray and put a damp sponge in at lockdown. The day they were locked down, we went into the first official heatwave we have had in 7 years. Could the extreme change in weather have had any part in this?
I have another batch in the incubator now, 10 "suprise" turkeys and would love some input before I get too far into this batch. They went in on Friday the 9th. HELP!!!