There is another possibility. There may only be three deer in the area. If I had hunted one place and seen three deer, I would certainly consider moving. The exception being if I was setup on a mature buck and had confidence at some point he would come by.
It is quite possible all of your calling and scents has tipped off every deer in 30-acres you are there. Without seeing why you chose the spot, I can make no suggestions.
When consulting, I continualy find hunters who have stands in places I would never put one. When asked ho many deer thery see, often, the answer is from none to few. When asked why they put the stand there, the answer is always, "It looked like a good place.".
I often had stands in places that little or no deer sign. I put them for one reason, I had confidence that when the traveling started, that was where the mature buck would travel. Sometimes, I was right and the evidence is on my wall. Many times I was right but it took place at night. Sometimes, I was dead wrong. But always...always, there was a lot more to it than "It looks like a good place".