I'm with Mallard Machine, never be afraid to adjust your spread, or, in some cases move it. If I see birds are shying away, I keep adjusting until this goes away, and I get them to come right in. I always like the wind to my back if I can, and by doing so on windy days there is typically a calm spot near the shore line, I find that Mallards like to rest in that calm spot out of the wind, so always make sure you leave a pot hole there for them to land. Also, I always adjust the number of decs I set by the amount of open water I have. If I have lots of open water I will set out 70 or so decs, if I have a small pot hole, I may only set a half dozen, you never want to overcrowd the pot hole that your hunting, birds will find another place to sit, unless of course the marsh is froze over and you have the only man made or natural open water hole around for miles, then look out, it can be awesome!!!