have you tryed lip squeeking in that spot??after you call and let things set for a min or if a fox starts barking at you,give him a lip squeek.a gray alot of times will give the wind no thought what so ever and come busting in fast when he hears a lip squeek.a mouse squeeker will do the same thing.of course one reason they might be leaving before coming in all the way is they saw you move.even with grays keep movment to a minamum.