re-record the vocals and sing everything an octave higher and it woudl song good.
it's an old recording. i still sing like that sometimes, but usually when I'm demoing songs at four in the morning and have to sing quiet. If I were to record this today, I'd probably be belting it out a lot louder and, as you suggested, an octave higher. When I sing that quiet, I have to sing low, it's just the way my voice works. I doubt I'll revisit this recording though, I've got more pressing projects to worry about than two year old cover songs.