Basically cool idea here, and I agree with much of the above.
I like a wide mix, but I'm not sure the hard panning is working. It kind of misses the unity, if that makes sense.
I'm picturing your lead vox ( which sound pretty good, by the way), panned about 50% left.
In particular, I'm getting "come spirit, come" as a call, waiting for a
Large response filling center to 50% right.
This is a potentially very powerful piece, but it's not quite there yet.
Work it, brother. I want to hear this one soar!