Gobblers are funny sometimes. You might sneeze and one will gobble at you but if they don't want to talk there is nothing you can do to get a gobble out of one of them.. I've hunted several states and have hunted for many years and in some areas I just never hear gobbles in the evening, but in some areas they gobble a lot in the evening as if it were morning time..
There are some areas I hunt where like in your situation you know they are roosting there in the evening and when I try to get a gobble in the evening I don't get a single peep out of them only to go back to the same spot the next morning and have several birds gobbling their heads off..
I told you they are funny birds....