Very cool song! Great ideas.
i think the guitars could be about 2-3 db's louder each.
i love the vocal delivery, but it's lacking in clarity. It would be cool to hear then solo and dry so i could make better recommendations, but it sounds like a condensor would improve things. If you're already using a condensor, maybe less effects or some EQ cuts to the low mids and a subsequent 2-3 dB overall level boost might help to cut better. It's not like they're competing with guitars, because those need to be more present too IMO. It's a general frequency thing methinks. Also, if your reverb has its own EQ, try tinkering with that when you have fresh ears.
i dug it all, even with the nits i mentioned. Excellent collab guys!