Are there any vocals? If there are, how do they mesh with this mix? I'd shoot for a little thicker of a midrange, but the vibe is pretty great already. It'd sound great cranked. I'd buy it.
If you have the possibility to reamp (if this is an amp, which it sounds like to me) I would retrack with SLIGHTLY more gain and a tiny bit more treble.
I was asking if you have DI signals of the guitar to be reamped. From what I'm reading, the guitars are already finalized. I would maybe consider a different impulse.
Your self made preamp has a nice tonality. What amp is it based off of?