Gonna read the thread but two things
1) being apathetic to who are the hydras helps to read them. I've played with and against hydras, and it's a lot harder for them as scum then as town. Town hydras tend to not focus on interactions and have a more aloof sense of the game. Good scum hydras attempt to do the same, but where it gets funny is when they need to defend themselves. Then they let you know who's doing the talking lol
2) if a blue role needs to claim, just say blue, especially I you are boxer. This happened last game with a few people claiming boxers when I was a cop, and it kinda narrowed how open my claim would be. I would just keep quiet and do the setup math in your head until later.