I would create staging areas in the 'jungle', preferably if there is a high and low spot in the crop field, I would do one in each area. Some bucks like to enter the field low where they are less likely to be detected, others like to stage high and be able to view the entire field before entering it. If that isn't available, corners or points are always very active entry/exit routes for deer in transition to feed/bed.
I would clear out 1 or 2 small (20'x20' ish) areas just inside the 'jungle' and plant a few apple trees, if there aren't too many in the area these will get hit very hard esp. if you leave them surrounded by security cover. You can get a couple different type of apples that drop at different times of the year, maybe throw in some oaks depending on what your area is lacking. The beautiful thing is you can create these areas according to prevailing winds and suitable stand trees.
As far as having too much cover? Where I hunt there is a lot of pressure, the areas that are nearly impenetrable are where the big boys hang out.
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