So when are the vocals and any longer leads going to be added (that was a nice lick at 2:20, but I wouldn't really call it a *lead part*

) ...or is this song just an instrumental?
Reason I ask is because when you have vocals/leads that need center stage, it has a big effect on how you mix/place all the other elements. It might change your approach and perspective to the stereo image/depth questions you had.
I see you now focusing on the OH drum mics and how you mix them with the spot mics...and sure, that will change the sound of the kit and open it up...but I'm curious how you are going to spread the guitars further out than they are, which is what you were asking earlier.
I still think you need to "dry them out" a bit before you can push them out, because when they are too diffused (reverb/delay), they get that "deeper" vibe, but it's also hard to place them more specifically in one spot.
IOW...you pan them hard...but the diffused sound makes it seem like they are coming from everywhere/anywhere rather than specifically from hard L/R.
Like I said...you can try a M/S matrix setup on the guitars..though they would need to be initially coded as a stereo track...and then the M/S matrix would allow you to mess with the Mid and Side individually...which means you could push out the Side more than the Mid...though watch out you don't end up with a hole in the center.
Not sure how that will work on just a pair of mono tracks panned L/R.....???