Thanks. Yes, the first stage of heat stroke is panting and airing out their wings. Next stage is that they lay down and when you force them to get up they are unstable and weak. Final stage is when their pupils become pinpricks, at that point they have brain damage and probably need to be put down. I try to catch it before they get to the final stage, but even at that I still lost two last week to heat stroke.When you say "problems" what do you mean? Panting and airing out their armpits?
Sometimes hot is just hot. Provide them ample shade, cool water, cool damp sand (if you have that in your run), and mine are always appreciative of watermelon and cucumbers (which are high in electrolytes).
I'm doing all that you said other than the cukes, I just picked some so I'll cut them up and give them to them now.
Thanks for the advice, hopefully others can learn from this as well.