I think all the ideas are good,especially listen to John's advice...I can say history of the areas I have always hunted have had currents running opposite to the wind direction...In this case, different from other suggestions here, it was best to anchor both ends of the decoys do to current...
Another suggestion here stated was to keep them seperate in the spread...Not to sound elementary because I am sure you have had many of outings with hunting whistlers, but they are pretty species sensitive...You can shoot blues over anything but Goldies like their own...
Regards,
Kristan