Set the rest to the east side, in two or three smaller bunches. Loose groups make them appear more relaxed, like they have been there awhile. Different wind conditions will require you to set decoys accordingly. Perfect decoying conditions are sunny, windy days when new ducks are coming down to our area. The worse days are calm days with no wind on the water to bring the decoys alive.
Ducks like to see lots of activity on the water before they decide to land.
Even professional calling and a huge spread of decoys can't fool a duck that is looking at mirror-calm water with no apparent life. To solve this problem, there are decoys available that are battery operated. They will quiver, shake, and make waves, adding life to your spread. One model is even in the feeding position. A less expensive method is to anchor one or more decoys to the bottom and run string from them to the blind.