Just wanted to give more praise for the BW.
My band plays 7's and I have a nazgul/sentient in it. It's great, but it's a very clinical pup. Every time I plug in my KM6 I'm astonished at the amount of harmonic richness in my sound. It has all the articulation I need but with a ton more saturation. Love it.
I would suggest trying a boost that allows you to increase the low-end a bit, rather than cutting it -- with the Nazgul. I also dial-in more bass through the amp when I'm playing my Nazgul-equipped guitar. Once you do that, it is a monster of a pickup. I agree about the BW though, it has just the perfect amount of low-end, midrange grind, and harmonic richness without any fuss...