I'm totally with y'all on the volume thing, and I consider my keeping the volume right as part of my secret weapon to get gigs over other bands.
But just as a thought to throw in here... and assuming all the bands in the area aren't playing the same songs...
As for constantly adding new songs, I think that
MIGHT be an overrated effort.
We're adding new songs, but mostly to improve the setlist, replacing duds, adding songs that are more danceable and and up-to-date,
but consider that if you have a good setlist that works with the crowd(s)...
they don't hear you every week like a house band, so after hearing other bands between your gigs, are they really gonna remember what your old setlist was?
And if they enjoyed it the last time (again, with other bands/setlists in between) is it really that big of a deal?
You may literally have gotten rid of a song or songs they liked to hear from you.
I think sometimes the
band members are getting tired of the same songs, not necessarily the audience.