We were pretty much in the natural fly zone. We had flocks of 100+ birds buzzing over. Sam, the guide, works on his boat for a living (oysters I believe) - so he is always out there observing what the birds are doing.
No, that's exactly how they were set. There were a few wood decoys around us - but he just had some lines along the edge. Worked perfectly. Like I said, we were limited out by 8am. Could have been earlier if we shot more in each flock.