V50 jetting/carb change?

I´ve got a v50 with race crank, changed primary, polini 50cc and 16/10 carb, polini exhaust.
I´m going to uppgrade to a polini race 75cc. which jet should i use or should i change to a bigger carb?

yeah it would run much better with a 19/19 carb

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i´ve heard that the 19/19 gives a slower gasresponse but higher revs if the crank can flush the fuel.
Has anyone tried my setup with 19/19 or 16/16?
I´m leaning towards the 16/16 with 80+ jet at the moment.
I only ride in the city and need more power from the bottom rpms more than topspeed.