I'd make the guitars a little darker- automate some kind of room impulse underneath. I think that would widen it up a bit if you can't quad track.
When the acoustic guitars come in- the first thing I noticed was that the strumming was conflicting with the hi-hats and the pattern the drummer was playing. I'm not sure if that's because it's not synched or that maybe I feel like the hi-hat could be more isolated.
I also think I'm hearing a clean electric playing root chords underneath. I may have wanted to compliment that with acoustic guitars playing the same progression or whatever to then put more emphasis on the vox/snare/kick/hat during that part.
I'd maybe pull a little away from the 200hz on the direct mic on the snare and maybe try getting some snare thump from some room mics/samples. I feel like the kick could be about the same- get some room in there for more splat or something. Definitely take advantage of those flam drops with some big reverb swells or something to make that stick out too.
I think the vocals could be a bit brighter/louder as well.
Not picking away at your mix, but when I hear rock/metal like this I always think of like Shinedown or Breaking Benjamin approaches. Keys, quad tracked geets and that focus on vocals/snare/hat throughout the songs.
