It was my understanding that switching to heavier weights would make your CVT short shifting at the expense of slower acceleration (although with less pumping losses ).
Also for a given RPM, heavier weights will be farther out which also applies to top speed.
I red that it is very much usual that your top speed is not at your max CVT gearing because your engine simply can't get your vehicle up to that speed.
Sometime, lighter weights will improve top speed by allowing the engine to hit its power band
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