They may have hens already or have been pressured by other hunters, I run into this sometimes and it makes hunting them tuff but what works for me is to get inside their comfort zone close to the roost either with or without decoys. I wait for the first hen or gobble call then do 2 soft hen calls a few min. apart then when I think they may fly down any min. I do a fly down cackle hitting my hat against the tree then when they fly down I scratch the leaves, this works pretty well.
During the day you have to play their game and ambush them making sure your in there comfort zone try scratching leaves without calling to them and just purring. In late afternoon try the roost area they should come in with no problem. Something else that works is using a large decoy flock of at least 5 and only soft calling with mostly clucks and purrs.

Let me know if this helped and good luck.