Just turn everything down so that you aren't too close to peaking at the 2Buss. You want to leave plenty of headroom on the 2Buss so you don't have build up issues, and when you get around to mastering it, it can be done properly. Sounds to me like the guitars have a lot of low/low mid content that is eating up the mix. Same for the bass, quite a bit of mud in there. I'd clean up that mud in the bass and guitars, turn the overheads (all cymbals) and the guitars and bass down.
That should be a decent starting point. Might not hurt to put a nice compressor on the 2buss to glue who whole mix if you haven't done so.