Well there's not much more I can do to ventilate the coop. If it's 98-100 outside it can't get much cooler inside the coop unless I install an air conditioner, which I'm pretty sure my hubby would divorce me over! The coop has 2 windows, the door into the run, a ceiling vent, and I have a fan in one of the windows. So it's ventilated to the max. The girls spend a lot of time under the coop in the dirt with frozen 2-liter bottles I put under there.
To your point, though, about hot eggs -- if a chicken is what 95-100 degrees body temp, then I suppose the egg is OK at the temp for several hours. I guess I will not worry about it.