can the riff raff produce that low "gonk gonk" and that low growl that those songs have? all of the sound clips/youtube reviews for the riff raff are oldies rock in E standard.
in downtuning, yes
I tune my '73 les paul custom to drop C# with the band, but earlier today I was experimenting with BF#BGBE (karnivool tuning)
it sounded huge (it already does in drop C#)
if you want a fuller midrange, the black dog wins in that department
for more extreme downtunings, I think the rebel yell might be the winner