Well it definetly has that Zep feel and sound to it. I am diggin that Joe is starting to mold a new sound away from his standard tone. He melts into the band and the music on this album.
I finally got around to installing (or rather, having BadgerDave install) the Custom Custom you sold me in the bridge position of my Mirage. While I'm not an unconditional hater of the JB (and liked it just fine in the Studio I used to own) the CC is FAR superior in the Mirage. I had a CC but never had a chance to try it before I moved it. Its on my short list as well. I have a set of Slash Alnico II that I think would kill in a Mirage.
I'm telling you Austin, call Mick, tell him what you're looking for, I'm positive he can get you something you'll love. The Goats Growl, that IS a great P90. That Mirage is in Canada now.