Take a look at the kits from Cycle Electric. Their replacement system (VR, Stator, & Rotor) puts out 35 amps at 1000 RPM and 54 amps at 2500 RPM. I just replaced my old 45 amp single phase system (2005 & earlier) to their 3 phase system when my VR went out. It has made a very noticeable difference. You already have a slightly more powerful 3 phase charging system in your bike, so it won't be as noticeable, but the Cycle Electric system is about the same price or lower as the Harley high output system.
2005 FLTRI Black Cherry, 95" Big Bore, Thundermax w/Auto Tune, V&H Dresser Duals w/Klock Werks SS, Andrews 26 Cams, SE Stage 1 intake, SE OD/6 Speed, Wards FCS cooling fans, Krome Werks Stretch Heritage +2 bars, Progressive Monotubes, 444's, & Touring Link, Michelin Commander II's, 14.5" Madstad, Lowers with Classic Motorcycle Vents, detachable King Tour Pack, Daymakers