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Heavier rollers or sliders really depend if the engine can pull the bike at a certain speed. If it's doing 3k RPM @50MPH it might be better to get lighter rollers, so the engine can develop more torque.
If it's doing 7,5k RPM @ 40MPH, then you need heavier rollers, or the engine needs to rev too high to go faster.
You could see if you can improve airflow, by getting an open air filter; then rejet the carb.
Sometimes BP Premium fuel gives a performance edge over other fuels.
Also, if it's getting cold where you live, get lighter engine oil, like 5W30 instead of 10W40.
You could also get rid of the trunk if you have any, get rid of the windshield, and duck forward when riding.
if you're getting ~55MPH out of your 150cc you're basically on the speed limit of these Chinese engines.
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