I find the same behavior as described in the OP. We lease a piece of property that has had an approximately 75 acre soy bean field for several years. The deer are plentiful and predictable when the crop is standing. As soon as it's cut, they begin to dwindle in both numbers and predictability. By late gun season, it's as if there was never a crop.
My experience is that corn is less attractive to deer but obviously they stick around as long as it's still there.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.