Of course they act different as the season progress's. They act different in a matter of hours. Maybe they commit less now than earlier is that, lately they've had hens running to them. The OP called to a Tom, and it didn't play out, I just don't buy call shy. Also there's no one gonna make me believe a turkey can tell the difference between a real hen and human produced call. Some real hens make the worst calls I've ever heard. While some sound like a calling contest.