Did you swap the reed block out for the Tomos reeds ? remove that exhaust port lip and get a new belt. Peugeots have loads of gearing options. You can get different belts, taller varios, different sprockets, fatter and taller tires, bigger wheels like 18" off of older pugs and Mobys.
Peugeots take tuning to a whole new level. Just when you get it running great and fast you can tell it wants more. It wants to rev higher and go faster. It screams for more while your pockets are hurting. Anyway a new belt will always help.