I have been feeling the same way this year. I had shooter 10, 9, and 8 ptrs all on camera from Aug - early Oct and now all I ever see is a young 6 ptr that has showed up or a small spike buck. Like you I am only seeing activity at my feeders around midnight if any. Very frustrating...... If we are in the lockdown phase then odds are you are only going to see a buck when he is finished with one doe and out in the daylight looking for the next one to be bedded down with. From research I have read they tend to only lock down with the same doe for 24-48hrs and then on to the next to lockdown.
Here is a great article I came across today on rut activity research.
http://www.outdoorlife.com/articles/...d-rutting-buck