What time of day did you hear a gobble while scouting?

They can roost about anywhere...
...but I would hone in on the creek as a roost.

I would reckon there's a drain or creek or something in the dense-looking oaks/hardwoods west of the red area...They would roost over that and probably spend A LOT of time in the hardwoods, especially if hunted, and probably almost ALL of their early-morning/first couple hour heavy gobbling time in there.

Get in, get close, don't rush the setup, and try to be where you think they're going. I wouldn't call until they're on the ground unless they are going bonkers in the tree and there's real hens yapping in the tree or another hunter that seems to be peaking they're interest for flydown.

Call when they're in the tree, they'll wait for you to show up in view. If you're close and you wait till they're on the ground, they will probably come in close for a look.

Just my $0.02 based on what you posted