Every cycling club that I've belonged to has it's own Culture.
Although the basics of safe and effective pace line riding are the same there is local etiquette and verbal/non-verbal cues evolved over time that are only apparent to riders experienced in a particular group's dynamics. Where a dangerous narrow bridge, the "traditional" sprint and/or hill top points are located and where to back-off affect a group's behavior, learning them is all part of being Socialized and Accepted as a fit, competent and "safe" rider. It takes time, participation and the willingness to earn respect for a place in the pace-line. Of course you will be Yelled At.
-Bandera