Seymour Duncan makes other Jazzmaster selections like the "Hot for Jazzmaster" and the "Quarter Pound Jazzmaster". Both of those will probably have more balls than what you have now for the neck pickup.
Just Google "Jazzmaster pickups" and you'll find a bunch of people that make them. Lollar, Fralin and O.C. Duff to name a few.
For the bridge I would recommend a Seymour Duncan Jerry Donohue, O.C. Duff Plankster, Don Mare 0038 and a DiMarzio PreB1.
I highly recommend O.C. Duff (Owen Duffy). He winds both the Jazzmaster and the standard Tele pickups. Easy to work with and since you already have a sound in mind, he's generally pretty good at coming through for you.
Duncan and DiMarzio are just going to be off the shelf. Duff and Mare you can communicate your desires to. Whatever you do, good luck.