We rehearse at a volume whereby we can hear ourselves properly. We're not a loud band anyway, but it's important to actually hear what's going on.
We also set up in such a way that we can all hear each other. In the round, generally.
We usually run the sets and then do new songs. We don't add new songs constantly.
I guess the number of years we've been doing this also helps. No superfluous noodling or tapping, just straight to work. Sometimes a curry afterwards.