I have been a CD for a long time and have done many different events. The fact that the OP asked his question show his disire to do a fare job.
No one but him can answer his question because he's the only one that was there.
When you have done enough events you learn to spot the good pilots and the ones to watch. This means you spend less time trying to watch everyone.
I have one rule for myself "if it makes me nervous, then I say something" When I go home at night, I'm the only one I need to please. That also goes for my flying.
No one can second guess you, and don't let them.
Always remmeber the whole purpose of the events to to have fun. I work hard to not lose sight of this.