Chiqita has a Bobcat that comes by in the Fall. They do like to get them in the morning.
You might try Free Ranging only when you are home in the Evenings for a Month or so until the Predator move on.
i've got a bobcat that stops by in the mornings, too, but i've never seen it later than 5:30 or 6, and don't let the chickens out til 8 or so at the earliest -- but i think you're right, i might have to shift them to afternoons only again.
(which would probably be happening anyway, since the new semester starts next tuesday and i won't be able to work from home nearly as much... boo)