IMO, the most important thing to try to figure out is whether that bird is roosted close to hens. If he doesn't have hens, and especially if he hasn't been peppered with shot coming to a call a few times already this season, you can pretty much do anything you want with a call and he'll come if he's gobbling on the roost.
I try to get at least within 150 yards of him in the tree. Definetly as close as possible as long as I can identify which tree he's in and I know he won't see me approach. I universally start out with just a few soft tree yelps. I will then get a bit louder until he answers (so I KNOW he heard me). Once he answers, that's it... I don't call again until I think he's about to flydown. I use this time to listen for other hens in the area. If no hens are heard, I'll usually start clucking and yelping off and on until he's on the ground. Then it's just some purrs, clucks, and very soft social yelps until he's in range.
If he has hens but they are separated by 100 yards or more, I still have hope. I'll usually try to mimic the most vocal hen, but call back about half as much as she is calling. I ignore the gobbler and his responses, as I'm trying to get that hen to pitch out of the trees first and come to me. Have to be careful here... in my experience, too much calling will just push the boss hen and they rest of the crew 180 degrees away in the opposite direction and the hunt is over unless there is another silent gobbler around. Have to also be careful to watch out for the dreaded tree-hopping hen... the one that won't pitch down, but jumps from limb to limb till she gets over you.
If the gobbler and hens are roosted together, I don't have high expectations. The first time I set up on a roosted gobbler with hens close, I'll usually kee-kee more than anything to try to pull the hens to me. That usually fails and I leave to find other birds. The second time I set up on that same bird another morning, I'll throw the entire book calling to the gobbler hoping to pull him off the limb and onto the ground. I mean, literally, I will call nonstop for 2-3 minutes straight when I think it's just light enough for him to be able to see to flydown. I've killed several doing that, but we're talking 4 or 5 times out of over 100 tries. Usually the boss hen just takes the crew in the opposite direction with the gobbler nonstop gobbling farther and farther and farther away. It's just tough to get a LB to actually leave a real hen who he has successfully mated with before when she's in sight.
After the morning hunt, I've either killed or the birds evaded me. If you don't have another place to hunt, the best thing is to just take a nap for a couple hours, quit calling, and try to move to where the flock likes to hang out during the day. I've had good success with toms that had hens in the morning catching them mid day when the hens have moved off to lay. I'll call in the general area, if I get a response, I'll move 1/4 the distance to the bird. Call a second time, and if he's coming, I'll set up and finish him off in a few minutes. If he didn't budge after the second call, I'll try my best to get close enough to see him and whether he has hens. Just one or two hens, and I'll wait him out hoping they break off. If he has more than 5, I'm off to try to locate another bird.
Since I have a fair amount of land to hunt, that's pretty much what I do for the rest of the entire day... however, I do like to glass from the roads right before flyup in the evenings to put toms on the limb for the next morning. I'd much rather get another morning hunt out of a bird than shoot him the evening before set up under a favorite roosting tree. When I added up the days of my first trips to TN, I ended up with 7 out of 7 mornings being set up on a roosted bird (only actually killed 3 out of those 7, though).
