So here's an update on the whining chickens problem:
I did a few days of experimenting on letting them free range MORE often, and found that this did not solve the whining issue -- it stayed the same or made it worse. As soon as they were put back in the pen after free ranging, they began to whine again.
So then I took the opposite course and stopped letting them have any free ranging. THis was my preference too, as during their recent free ranging they have destroyed a couple plants in the garden either by eating them or by digging all around the plant to the point where the whole plant was dug up and torn to pieces. AFter a couple weeks of no free ranging there was much less whining. Now they are no longer whining during the day when there is no one around. They still whine if they see a person, but generally not when they are left alone, so at least that has gotten better.