If you can call in Hens and jakes then you can call in Toms as well. It sounds to me that your spending your time in the area early season and this why your seeing the hens come in for a couple reasons,

1/ The Toms are henned up bad

2/ Too many hens that are not on nest.

3/ to early in the season

Hunting later in the season can change the way your calling works on gobblers. Jakes tend to over take hens in the early season as they group up and take over on the toms. Remember the less hens to work with, the more you'll see gobblers coming to calls.