gilera runner 2006 -> new model tuning advices

i have the new gilera runner sp
i have tuned it so far with the following:
cylinder iron cast malossi
carburetor del'lorto 21
variator malossi with rollers 5,7gr
delta clutch malossi with wing bell clutch malossi with green spring
kevlar belt malossi
and exhaust leovince zx 70cc

my question is what of those shall i change?(gr of the rollers,harder spring?)and what could make my scooter really better? reed or else?
Shall i change my carburetor from 21 to 17.5 one? will it do any better or the 21 is best?(no changes made to the carburetors)
also i just have put on the clutch with the green spring and didnt do a huge difference in acceleration as i expected.
maybe i should use another color spring?
and also the spring wasnt the same size as the original one from the variator although i ordered it from the malossi store...is it ok to use it or shall i find the same size?

thats pretty much my old set up except ive got pm clutch ive used the red springs and a red contra spring, i used 5.5g rollers

i dont realy like the zx exhaust i had a look at one and there full of baffles wich still restrict performance, yasuni seem to be the cheapest realy i have a c16 but its not road legal and if you plan on keeping it more than a year you should change the crank or it will seize up like mine did

and if you change your reed valves stay away from pm mines just snaped and ended up in the crank case

about the carburetor...shall i change to 17.5 or stay with 21?
i already have it tuned for a year and the crank didnt have any problems yet
well i have made some changes to the exhaust and it doesnt have any restrictions now..although i found a malossi one shall i buy it?
also about the clutch...it didnt make any difference as i said before
what shall i do to have some massive acceleration? maybe the hardest springs i can get or use red malossi ones?
ah btw in the cylinder when i opened it once i noticed some minor scratches...shall i fix em up in a workshop? are they doing my scooter to lose a lot of power?
also shall i buy an aluminum cylinder or stick with that one and fix it up?
my real problem is that though i have tuned my scooter so much many other lower tuned scooters beat me in races...im 92 kilos and i think thats something that matters(im tall not fat )

21mm is the best carb you can get for a 70 kit in my opinion. Stick with it. Seeing as though you're a big lad maybe you want to look at a 125 with a 172?

well im looking at ninja 250r for next year
for now im just looking into tuning my scooter at max and have some fun with it cuz im gonna sell it soon...
any help about the others im asking?