They do. And the only thing you can do to the Zenith to make it airier is to drill out a few of the (already existing smaller ones) airholes, because the Zenith (which I do not find that airy, although the vapes sort of "comes out" airy. if that makes any sense at all but I sometimes think it might benefit from more airholes.
Because you don't have an "endless turning" airhole ring, this is an irreversible solution given that you can only turn in one direction. So if you want the airholes bigger you'll HAVE to have at one of the ones already present, and you won't be able to change the increase by turning the airhole back. Once it is done, it is done, so to speak, although it seems like you rather badly want more air, so like, that is your option. Just be sure it's what you really want to do. Etc.
Anna