I went with 13g Dr P's....but removed them, too buzzy. Too many rpm's at low road speeds. Might have been giving me rocket take-offs, if I wanted. But I don't stress my scooter like that. 'Brisk' pull aways from a stop are best for me , plus 'brisk' prevents jerky clutch slipping.
Went to 14g sliders for yrs now. Smooth as butter take-offs.
Don't know much about max speeds with either weight, as I never attempt that.
I can hammer it uphill if I need to....seeing maybe low 7k's on my tac and keeping up with traffic.
So, I've been happy with the 14s.
(take some pix please of your servicing - always enjoy seeing scooter stuff)
Stig