Call me a believer, but deer seem to really "tighten" up during the middle two weeks of October. It is a combination of factors, the biggest one being hunting pressure and shifting food sources. For me, I hunt around no crop fields most of the time, so I have to find the hottest food around...and that is white oaks. It can be difficult to pinpoint the changing food sources. I see less deer during the middle two weeks of October than any time else, and have so for the last 8-9 years while hunting during bow season.