Jimbo,
I have a Lucas 3-phase with a Podtronics regulator that allows me to idle around Daytona during Bike Week for 5 days with my halogen headlight on and requires no supplemental charging.
Since you have the Lucas 3 phase stator, perhaps all you need is a new regulator/rectifier such as the Podtronics, Tympanium, or Boyer Powerbox? I am assuming you are running the wafer rectifier and zener diodes currently.
Or perhaps your battery has a weak cell?
I certainly would not change out the stator for a small gain. Is this an electric start? Are you running ancillary electrical equipment? (electric vest, GPS, driving lights, etc.)