This usually means 1 thing and that is, Petronas RON95 has lower octane rating than listed. Probably only RON92? Try Shell and other station and see how it goes.

Felt any difference between Shell and Petronas RON95?

This seems normal for CVT. Google and many people complained about noise.

Engine not only sounded loud, they sounded funny like those toy cars using winded up metal band. But once above 60kph, should sounded quiet. But somehow not many people complained about this.

I know majority of people can't accept this fact but if you study the car manual very carefully, it clearly said the most suitable oil for CFE is Mineral 10W30. So unless the manual is printed wrongly or you think you are smarter than Lotus engineer, go ahead and use whatever you want.

I am only repeating what the CFE car manual says so any objection/dispute/questions, you take it up with the Lotus engineers who designed the engine. Leave me out of it.