So I ordered the Aguilar DCBs and had them installed in my Sadowsky.
They are an improvement and restored some of the mids that were lacking in the more "scooped" sounding stock Seymour Duncans.
While the tone is very good - somewhere between Bartolinis and EMGs - I find the pickups produce a very "pretty" tone that sometimes gets lost in the mix if I don't turn up the low mids on my amp.
I feel that my situation is a special case because it is a Sadowsky Modern bass and the pickups are both postioned close to the bridge. The body is also made of ash and the fingerboard is rosewood, which seems to be an unusual combination. I usually see Ash/Maple and Alder/Rosewood. The alder wood seems to produce more natural mids.
The other day I placed an order for Nordstrand Fat Stacks and I'll be getting them installed with a push/pull switch on the volume that will allow them to run as either stacked hum-cancelling or single coil (essentially Big Singles).
From listening to lots of clips and reading the tone profile on the Fat Stacks, I think they'll give me a natural bump in the low mids and a bit more growl.
I'm hesitant to make the change though, because the Aguilars really do sound great but I love the bass and am enjoying tinkering with the tone so...