Here in SW Louisiana, it seems like there's a blind in every field, and as a hunter drives down the road, he probably can't help but scan the levee for that blind anytime he sees a flooded field with a single big bunch of "birds" near said levee. My thinking is that ducks that have been around a while just have to be doing the same, and my flooded field tactics eventually evolved to reflect the most obvious difference between fields being hunted and fields the birds are actually using. That being that the real deal can nearly always be seen scattered about the flood, rather than all lumped next a place guns can hide.
My MO was to scatter decoys in mostly ones, twos or threes widely over several acres of water as essentially confidence decoys to lend credence to a much more dense concentration of larger "family groups," presumably taking advantage of the most prime feeding area near the blind.
First time I employed that tactic, I was a bit fearful of looking the fool when birds landed with outlying decoys well beyond range, but decent calling negated nearly all of that.
As for the goose decoys, I strongly suggest not putting out more that you're willing to pick up each trip, as geese seem much quicker to learn decoys are that in your absence than ducks. And I'd make stake extensions of 1/2 metal conduit or some such that allows you to get all but perhaps a couple goose decoys off the levee and out in the pond, where their appearance will lend credence to the appearance of shallow, easy feeding water.