Like Old Dog I tone it down a whole bunch,in fact I wont even yelp to gobbler that I believe is call shy, do to hunting pressure.Along with this I make a concious effort to set-up as close as I dare possible to a bird like this so that he can hear me scratching in the leaves and calling ever so softly.Patience is a real key in your calling here and soft clucks and purrs are the ticket.You high ball a gobbler like this and try and get real aggressive with him you'll be waitin till the next day to hear him again.