I would go the other way -- try lowering the level of the backing tracks first. Real nice energy rise in the chorus (with the extra vocals helping, too). Overall it's pretty good. At 6:42 it is way too long -- but I know that is super subjective. A song should be as long as it has to be. For me, just under 4 minutes is where my attention started to waver.

A song that I like a lot is Mrs. Potter Lullaby and it comes in at 7:45 so I am not morally opposed to longer tunes: https://www.youtube.com/watch?v=Xdt58T366xw

Now at bandcamp: Crows Say Vee-Eh @ bandcamp or soundcloud: Kevin @ soundcloud