Decoys:
For me I own 6 crow decoys and 1 owl. I will usually just put 4-5 on the ground in a visible location and then put the others in a smaller tree as high as possible. I tend to do better without the owl in the area I am hunting right now, but I think mixing decoy set-ups up all the time gives the birds different looks and makes them more interested (hunt same area, but in different places with different set-ups). I will also use no decoys at all, just the call in thick areas. Pretty much turns into pass shooting, but you have to have a quick trigger.. 