All very good advice. Turkeys in some areas have vast travel patterns. Food and good nesting areas are the biggest influence for hens in the spring. Find or hear the hens the gobblers aren't far away. 6000 acres is a large area. If you can find clearcuts or good open areas where gobblers can strut. That's a good start, if you have a lot of predators. As far as calling sounds like you have all you need. Persistence kills birds. Eventually, if they are there, they will let you know. Goodluck and don't get discouraged.