It has been awfully warm and the long term forcast does not look much better as far as colder/wet weather goes.
There was a good deal of mositure most of the spring and summer so there is food all over (high and low) so I don't think they will "move down" unless by some miracle it snows 12" by the time your hunt starts. That being said, there are deer down low in the plains and up high in the timber at any given time. The deer numbers in this unit are pretty good but 180+ deer will be very tough to come by. I would say 165/170 (26"-28" wide) deer are more realistic.
Good Luck. Let us know how you do.