I nearly always use decoys on the first set up in the morning on birds patterned in fields. For them to produce a kill right off the tree, the key is not what decoy you are using, but rather ensuring you set up close enough in the field so that they can see them from the roost. If you have several gobblers in the big flock, that's even better, as I've found that the gobblers will fly down first before the hens competing with one another to get to the decoy.
OFC, it's not easy getting set up within 75-100 yards of a roosted bird on the edge of a field. It requires that you set up in complete darkness with no light (I usually do this on a bird I've roosted the evening before and know exactly which tree he went into), sit for another hour or so without making a single call, then just give a few soft yelps about 15 min before flydown (just enough to ensure he heard you and begins looking for the decoy). After that shut up and let the decoy do the work. Call too much after it's light enough to see, and the toms will realize your calls are not coming from the decoy.
If you're set up on a single gobbler with a few hens, expect him to let the hens fly down first before joining them (unless he's got competition nearby). That's where a jake decoy comes in pretty handy. Again, having it within sight of his roosted position is most effective.
If you're on a huge group of birds still flocked up (30, 40, 50 or more), that's where an entire flock of decoys works extremely well. I've had 6 gobblers and 40 hens pitch one after the other right into a decoy spread with 4 hens, a jake, and a tom decoy.
After flydown, I'll only ever carry a single hen decoy. I don't use decoys in the woods, and I've found out you are probably more likely to spook birds just trying to get a decoy in a field to work a bird after sunup.
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