interesting...not sure how to keep a hen quiet...maybe someone else has some more advice...have your neighbors complained? Have you offered some free eggs so they don't? That may be a suggestion so they don't get angry...
how old are they?
are you sure they are all hens?
They want out...do they have a run to stay in or do they free range?
I am not sure why the breeder told you to keep them shut up till 8am...mine are out as soon as the sun comes up really....
they always cluck and chatter when I get to...