possibly try an unconventional set up closer to where the bird typically struts or enters and exits the area just getting your decoys closer to him may be all you need or simply intercept him naturally traveling. The best way to kill a big bird decoy or call is be where he already wants to go makes calling and decoying them in much easier.
It is a hard situation where this bird is. He is out on a power line and varies within a quarter of a mile as to where he and the hens come out at. I do know that 3 hens keep popping up in one certain area though. Perhaps he is in hiding where those hens keep showing up at??