This is what I would do:
Play back the mix in mono. While the mix is playing, take turns muting each of the guitar tracks, and listen carefully for which mute makes the mix sound sound better or worse. Maybe more than one of the guitar tracks needs to be removed, or maybe just one will do the trick. When a mix sounds good in mono, it will sound good in stereo too. Although you will probably have to adjust the panning if you remove any guitar tracks in order to re-establish a good stereo balance again.