I'm recording 4 heavy distorted tracks/melodic death metal. Two guitars hard left and hard right doing the heavy, chugging rhythm parts, and two guitars panned 85L and 85R doing lead/melody parts. However, at some parts during the songs all four guitars play the same riff or play the same riff harmonised. I've found that this can sound too large or loud in comparison to the rest of the mix when all 4 tracks play the same/similar riff. However, recording it on just two tracks sounds too empty and soft in comparison to the rest of the mix. How do I get around this?