A favorite and proven tactic of mine. Many times i have had birds that would respond very well to calling but just would not commit to coming into the set. After figuring out that its not going to happen, ill let them drift away just enough where i can sneak in and set up where they had just been/hung, andset up and get aggressive with my calling with yelping and cutting, it seem to fire them back up and they feel more comfortable comming to the set because they had just been there. It kinda co insides with Jmbuckhunters tip of being where they want to be. It has worked very well for me but you must be very careful and not get busted when resetting positions.