Are you calling them from the hedge row?? That could be one of the reasons they split when they get in close. They know that there is no way a goose would be calling from the woods. If you have to stay in the hedge for cover the person calling has to be in the spread.
I agree with some of the above suggestions, move out into the field and make yourself invisible.. If there is snow in the field buy a tyvek suit from home depot (only 8 bucks) and cover your face and head with something white (home depot sells a white sock for painters that covers the head and face)and just lay in the field. Can't beat the excitement of geese literaly landing on top of you...
Good Luck...