RE: How do I know when I'm too close to the roost?
IMO, if they didn't PUTT at you, then you didn't disturb them enough to "change" thier plans. Case in point, this last Sunday morning, we set up close to the roost of several turkeys in a creek, including 4 long beards. I actually moved my blind to the spot Sat. night when they all quited down for the night. BUT come Sunday morning, we had turkeys roosted inthe creek both directions from my blind. Long beards to the left and hens and jakes to the right. All the hens, and 4 jakes landed between 40 and 60 yards directly infront of the blind, but all 4 long beards flew out to the other side of the creek and gobbled until all the hens walked over to them. Hens flew down first even. AND that's the way turkey hunting goes sometimes. You can't out guess them.
If they didn't PUTT at you when you were setting up, I highly doubt that they flew the other direction because of you!