Going to a lower weight on the rollers will almost always lose you top end, but 10mph? 5mph is definitely understandable.
The CVT transmission is customizable in one direction or the other: top end, or low end. We recommend people set it up for their personal riding style and the environment in which they ride the most.
If you're mostly riding in places where you want/need top speed, get a set of 12g sliders - they'll keep your top speed, and give you a bit more low end than rollers would. If you've got a combination environment of some hills and some wide open, go 11g. 9 & 10g are for trail and climbing where you rarely have the opportunity to go wide open anyway and that low end is most beneficial.
It looks like you've got a good setup, just get a different (heavier) set of slider weights to swap in when you need them and you should be good to go!
You might also consider a no rev limit CDI - the 9g rollers really increase your RPMs and you might be hitting the rev limiter in the stock CDI - this might also be a reason for the top speed loss since the engine CAN give more but the CDI won't let it.
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- Mike
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