Perhaps: "You Don't Know"

[Dangerous]

I haven't had a chance to play with this yet so I'm not too sure of the dynamics at play. What usually happens is the bass notes are picked up by multiple mics, and depending on the frequency and mic locations that capture these sounds, the combination can add or subtract these lower frequencies when summed. High pass filtering and phasing adjustments across the affected mics can help. I have noticed with your mix that there is some bass audible in the side channels. You could try and high pass filtering these out on the master bus. It may help with tightening things up in this regard.