This sounds amazing! One thing I'd suggest is possibly adding some brass (probably trumpets) or saxophones, just to beef up some of the layers, and they could be added in towards the end of the 2nd refrain. I can already hear in my head that there's lots of potential for little brass stabs at certain points, or some harmony between saxophones (which I personally ADORE). Either way, with or without reeds/brass this sounds kickass.
Oh man! Thank you so much. And I totally feel you on the wind instruments. It’s such a balancing act between keeping the band small enough to stay appealing to stage producers but still fully realizing the potential of the sound. You’re 100% right though. Horns would kill!