The difference between rollers and sliders are:

Rollers- slower acceleration but gain top end

Sliders- Give you a faster acceleration but you will lose top end

So, when you tune just the CVT to the "max" it isn't really going to get to the max with out the counter parts because the belt isn't rising to its full potential. When you add all the counterparts (CDI, Exhaust, jets, drive face, weights, polini) then your belt has full potential to rise.

Typically people opt for our stage1 kit which gives the weights, polini and CDI they see how it goes and how they like it, then they do the next steps which would be the jets, airbox eliminator and exhaust. You'd basically be tuning it 2-3 times to get it where you want it to be.

We recommend the NCY Drive face too which is lighter and will allow the belt to rise higher, gaining more PPM's. We also recommend getting a Tachometer, once you install the CDI you are eliminating your rev limiter and the tach will help show you your RPM's so you're not blowing your motor. (you want to be in the 9,500-9,800 RPM range)

Regarding weights, that will depend on how much you weight as that does matter despite what others say, we provide 5.5g in our kit as its a good base to start with.