I don't know what to suggest, but there must be something in the middle ground between the Warpig and the Rebel Yell?
The Pig has loads of bass, the Rebel Yell will be tight but it really doesn't have much bottom end at all.
Like...?
Well, as I said, I don't know...... :? It just seemed to me that "Warpig vs Rebel Yell" is a little odd as an either/or comparison, because they're virtually opposites.
Nailbomb, perhaps, as has already been suggested, although I've never tried a Nailbomb.
Black Dog, maybe? Not particularly hot, but plenty of low end and they say it's good with dropped tunings or extended scales.
Or what about the new Alnico V Black Hawk?