Setting up a good headshot on a Tom has more to do with preparation than actual archery skill. The four areas to concentrate are; equipment and setup, coverage and presentation.
During the deer season many archers have their bows set up on a high draw weight. This is not necessary beneficial with hunting turkeys- especially headshots. Remember, you will be shooting at a closer range and therefore knowing your angle is more important than power of the bow. Moreover, in order to make a good headshot you will have to be already drawn back for a minute or two before the shot can be made. So therefore, a high-let-off bow would be more beneficial. You can top off your equipment with a good broad head. One that gives you 4inches in diameter coverage is perfect and more forgiving than small coverage types.
No matter what blind you choose, try setting it up the night before your morning hunt. Ensure that the blind is not silhouetted in a field by the morning sun or that you are not silhouetted inside the blind. Turkeys are very observant creatures and they pay attention to the finest details. For safety, make sure you have enough room in the blind to be confortable as well as shoot safely.
One of the most important elements is the decoy spread. You want that Tom to get close enough and sit still long enough to make that great headshot. Setting the Jake behind a submissive hen with 2-3 feeder hens in the spread could be the way to go. Finally, finish off this great spread with some good sound. Now, turkey calls have a lot to do with the user than the actual call. Some people are just not good at using some calls. Make sure you are using a call and practice using it to ensure that you are producing an authentic sound. Just like setting up a good fishing rig- presentation is everything. Wait for the shot! Wait until the Tom approaches the Jake and assumes his dominant position- it will be his last.