Its not just Seymour Duncan. Pretty much everyone manufacturing pickups from the USA, Europe and even Asia across all price points are making better sounding paf style pickups than the gibson 57.
Anyways...funk R&B and jazz....just get a pair of Duncan 59's. They are very clear and defined in a 335. They also sound great with any magnet swap you choose if you want to fine tune their sound later on (which means you dont need to go thru the nightmare of removing all the wiring again).
Epiphphones have notoriously cheap and nasty electronic componentry, so spend a few extra bucks on swapping in good quality 500k pots, nice caps and a new switch and jack. You can get a good cheap upgrade kit here:
http://www.guitarfetish.com/Complete-Les-Paul-Upgrade-Electrical-Component-Kit_p_179.html
nice caps here:
http://www.guitarfetish.com/Sprague-Orange-Drop-Tone-Caps-022uf-for-Les-Paul_p_695.html
or you can possibly get a wiring harness all pre-done for you using absolutely best pots from bourns and vintage style paper in oil caps like this:
http://bcsguitars.com/?page_id=2760
Which will save you a lot of time and get you a great result.