I doubt a SD jazz pickup of any configuration will be as hot as a Gibson TB plus - there's bound to be more winds, there's more space. Two coils side by side in an appropriate sized enclosure rather than two coils squeezed into a Jazz pickup because of a desire to retrofit Jazz basses.
Anecdotally, these don't seem to offer much increase in output over your typical Jazz pickup - http://www.talkbass.com/reviews/showproduct.php/product/134/title/seymour-duncan-hot-stacks-for-jazz-bass/cat/16
Relax, just increase the preamp gain. You like the sound that comes out, regardless of the output level, yes?