FWIW and since Bluegrass has been mentioned the biggest issue I note in some attempts at a BG mix is leaving the rhythm in while the respective instrument is soloing. Doesn't matter where you pan the solo in this case because it just doesn't happen with an actual BG band.

Another FWIW, I try and mix BG the way I would hear a typical live band if I was sitting dead center of them in a room with no mics.

Bass center
Lead vocal center
Harmony vocals L/R 12 out (Logic Pro value)
Guitar L/R close center 6-8 out
Rhythm banjo, fiddle, dobro, mandolin L/R 17-20 out
Solos L/R 10-12 out


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