Lots of good advice.
Henned up birds are tough. I'd handle it through a combination of some of the above posts.
Get in as close as possible on roost. Just a couple of tree yelps to let him know where you are, then throw your call 3 feet away...LOL.
This does a couple of things. Obviously it lets him know where a receptive "hen" is, but it also keeps all the other hens from racing to him before you can get to him. Once he responds, he knows where you are. Keep him quiet on the roost if possible. The more he gobbles, at this point, the more fired up the hens will be to get to him. This is one of the few times in turkey hunting that you want to curtail his urge to find a hen just a bit. It can be a dicey play, but odds are much better doing it this way than an all out yelp fest on the roost with a gobblin' chorus.
If that doesn't work, you can try a bit more aggressive hunting up through about 9:30 or so. Satellite birds that have been beat down by a dominant gobbler will be around not far from him and his harem. These birds rarely come in gobbling. They will often slip in silently to sneak off with the "hen" that is obviously in need of love. Lot of guys think that those satellite birds are always jakes. That's not necessarily true. They can be jakes, but also are sometimes 2 year olds that just don't have the "mojo" the dominant bird has. They can also be a very old bird that has lost his "mojo" and just looking for 1 last fling with a hen.
Finally, into the late morning hours, get in front of the birds and wait on them. Don't call, don't do anything but wait. Calling at this point, frequently ends in the hens pulling the gobbler away from the caller.
If you can hunt through until sunset, most of the time a gobbler will roost in the same area (if not the same tree). At this point, you should know where that is. Find the area where you see leaves scattered and a few feathers. Almost always on the same level as the base of the tree or on higher ground. This is his "take off" area to head to roost every evening. That's an awesome place to kill a gobbler.
Henned up birds are tough, not impossible, just tough.
Ken