Sorry for your losses. We just went through some 100+ degree heat this is what we did for or chickens to help them through the heat.
Took milk jugs filled part way with water and froze them and put them in run they would lean againt the jugs, sprayed down run so they could dig down to cool dirt (they lounged around a lot), added more shade for them, filled extra waterers if one was in sun they wouldn't drink from it at all even if only one available. They refused to drink warm or sun heated water. So gave them cool water regularly. Opened up coop to allow as much air exchange as possible, I thought it felt stagnant and oppressive to me was worse for them because of their higher body temperature. We gave them weeds to eat, melon, wet feed to increase water intake. Most importantly added electrolytes to water to prevent dehydration. Also added a shallow pan of cool water a couple inches deep, they would stand in it, even bathe play in it to wet feathers! Strawbales around run on outside of the run were soaked with water to give some radiant cooling.
Our 1 year Olds are mixed flock Welsummer, California Greys, EE'S and BO roo. The 5 month olds are all BO. They all made it through the hottest day so far this summer of 105 degrees!! They were most active in the cool mornings and evening when it began to cool down. This was when they would eat the most. They did drop off eating as much as they normally would and drank much more. Egg laying dropped a bit, all did continue to lay just not normal schedule. During the heat the 5 month Olds started to lay, the added heat stress didn't seem to have hurt them.
I am sorry for your losses. I hope that the things I do for our chickens in extreme heat gives you ideas on how to help your chickens.