I would think that you'd have to use a completely different approach to "memory aids" and "set lists" for a small group than you would for yourself as a solo act.

It's all well and good for you to have that way-too-long list when working alone. We all have our own mental "shorthand" and each of us knows the short reminders that will jolt our memories, helping to bring back entire arrangements and full sets of lyrics.

The same approach couldn't possibly work for a trio. Even though you might be old friends who share similar backgrounds and memories, you have three separate minds. Even if you seem to experience mental telepathy on some level when you're playing, you really can't read each other's minds when you're trying to figure out what to play next.

Why not restrict your set list, or "reminder" list, to songs that you've actually rehearsed together ~ recently!