It will only benefit you to register with either BMI or ASCAP. But you need to make sure you register all your songs with the performance rights company, as well as make sure all your paperwork is taken care of, such as in the example with the guy who had his songs on a tv show or commercial. Maybe the production company never sent in the cue sheets. If i'm not mistaken, you should be able to be pro-active and get those filled out and send them in yourselves, but don't quote me on it.
It's tough, but if you have a ton of music being performed publicly and you have all the paperwork handled, you should be straight. But don't expect to get paid for at least 6 months.
TBF