You may not ever be able to cure the noise completely. It's just the nature of the beast, something you have to deal with with a belt drive. Some notice it others don't. As long as the belt is adjusted per the specs published in the service manual, and the wheel is tracking properly, you shouldn't have any problems (other than noise!)
How many miles are on the bike? Some have reported the noise goes away after a few thousand miles.
"8 But God demonstrates his own love for us in this: While we were still sinners, Christ died for us."
Romans 5:8 (NIV)
2014 Kawasaki Vulcan 1700 Vaquero ABS SE
iPod Connector Kit, Kuryakyn Highway Pegs, Mustang Touring Seat, Marvella's Hitch, Kuryakyn Trailer Wiring Kit, Haul-Master Tag-a-Long Cargo Trailer
2011 Honda Shadow Aero 750 (Wife's)
Memphis shades quick-release windshield, OEM Solo Seat, Mustang Fender Bib, Chrome Solo Luggage Rack
Past: 2006 Vulcan 900 Classic LT