The birds I've hunted have gobbled more on the roost than at any time once they hit the ground. It's like they shut up completely. I'd try to locate them on the roost the evening before the hunt and set up on a field edge near them. I call only with clucks and purrs and only do light yelps before it's time to fly down. Also, do not over call. These birds are tough to hunt and are very elusive. The easterns I've hunted would gobble at a loud fart, not so with osceolas. Good luck and if there are any other questions feel free to ask.