If the deer are out every night you should be able to find a main run going to and from the field. As you stated, they are use to human traffic so a walk in the field won't stir much attention. Corners of the field have been producers for me over the years. Once you find a run, set up inside of the wood line by 25 yards or more from the field. At this point, you can watch both the field and the run for movement. Sometimes you will need to move your stand a few times before you hit the right trail.