I guess I've got kind of a unique perception of pickups, but I've never found the JB loose, as everyone is saying. How can it, when it's low-end barely reaches down at all? What I will grant you is that the JB has a lot of stuffiness going on in the low-mids which can be hard to control, especially in low-mid-rich setups like 5150's and Mesa Recto cabs. But then again, I personally find the JB is a fatter-sounding pickup than most people give it credit for.
While the Black Winter does have a bit of a dirty voicing to the low-mids, I agree, it's not nearly as much as the JB. At least not in sheer quantity. I've never had a problem getting the Black Winter work with tight fast riffing. I mean, that is what it was designed to do.
But I also find it slightly oxymoronic that it has "rounded mids", but at the same time "sharp ice pick attack". IMO, its mids lean A LOT more towards the cutting, raspy edge of the spectrum. But rather than being sizzly like the Distortion, it's just bitey and attacky. So yeah, in that regard, it is very attacky. And while it does have the slightly dirty voicing to the low-mids, agreed, I think the high-mid emphasis highly overpowers it.
People consider the Custom/Custom 5 tight. And for me, they're the complete opposite. They've got a HUGE low-end that's, for me, hard to control if you're downtuning. And the Custom has the fast immediate-feeling kind of low-end (to an extent) because it's running on Ceramic, but the 5 isn't.
Then again, I am used to also using actives which are all mids and Tube Screamers, so take that as I grain of salt.
Also, what I play with the Black Winter is more along the lines of chunky riffing ala Sweedish metal rather than complex cords and sizzling distortion a la Norway. But I feel the Black Winter has no problem getting its Opeth on, TBH.
Sorry to defend the Winter so passionately, LOL. It's just that I love it so much. It's my favorite Duncan.
Buuuuuuuut, also don't discount the Gibson 500T! It's a bit more old-school sounding than the Black Winter. Not as attacky and slightly fuller, and it's not as sizzly as the Distortion either. But kind of along the lines of both.