So you KNOW you're getting birds in to 60yds or so, repeatedly and they just arent finishing?
In other words, you're seeing them and not just speculating on the distance based on how far you think you're hearing him from?
Bottom line- you've got to change something if this same thing has been recurring for 5 seasons.
I dont know if it's legal where you hunt but if you know their roosting habits then go in and hunt in the afternoon and try to get them on the way back to roost before they fly up. If you cant then maybe you'll at least be able to roost them for the next mornings hunt.
My best guess is that you're dealing with gobblers that have hens with them at flydown time...my solution to that would be to be patient and hunt them in the mid morning to early afternoon. Hens eventually leave later in the morning and they're alot easier to call all the way in when they are lonely.