RE: AIRIAL PHOTO
I would look to see if there is a particular spot along the pond that they seem to come to drink at more often than others.
Is the swamp that area to the right (east?) of the pond? Regardless, you ' may' have a funnel area between the pond and the swamp.
There may be particular paths that the deer use to cross the powerline clearing(s). Set up 20-30 yards into the woods along those paths, possibly.