The industry standard is simple. Songwriters get publishing deals. Bands do not. Bands do deals with record labels. It helps to generally think of things as "the band's share" and "the songwriter's share". I'll dig out a link to a book that it would be a really good idea for you to use as a reference, and if you are going to go back to your band it would be useful as proof that what you are saying is standard practice.
In the pro industry the songwriter gets a slice of every performance and the sale of every recording. As a member of the band you also get your share of performance and recording from the band's share.
Band members tend to get an equal share of the band's share.
Unless signed to managers and promoters etc, band members who are not the songwriter(s) could increase their share of earnings by:
managing the band and getting the manager's share
promoting the band and you guesed it
and of course
writing some songs