If you know someone is a calling station then that is generally all the inforamtion you need. There is only 1 way to beat a calling station: show them good cards. Draw cheap and don't bluff. Suited connectors are more playable, high pockets have to be treated with care as you're unlikely to know whether you're ahead or behind. Calling stations are probably the easiest of all players to beat. It sounds like you're on the right lines already, just bleed them dry with quality cards.