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I wish I had money for literal fancy pants 😋

As long as the inside of the bell is clean metal it does not matter. If it's smooth as glass that means the pads will last longer.
However the pads need to be cleaned sometimes they can get sticky and won't slide without shuddering

Slipping is beneficial it allows the motor to maintain higher RPM on launch. Too much grab can be a problem my 250 had a hard time with launch it would shudder and grab.
The solution was a couple drops of 80W90 inside the clutch
Worked fantastically after that

If you are concerned about the clutch slipping at speed 
You can be assured this is just not a problem with a centrifugal clutch any faster than 15 to 20 mph and the clutch behaves as if it was welded together. 
It is completely locked until the bell explodes from excessive centrifugal force
Wouldn't that be fun 😱

8000 RPM is way out of the power band
you're contra spring is too strong
or your weights are way to light
Or the CVT is getting jammed
I have had all three
Time to open her up and take a look
At 50 you should be at about 6000 RPM
Make sure your weights are at least 11 grams
I liked having 14 gram weights

As an after thought you may also have a short block gear set

If you smell a greasy oily smell from your scoot you either need to clean the motor or the valve cover vent is emitting to air.
The carb is supposed to ingest those smelly gasses.
It's part of how it avoids running lean.
Normally a small chamber of the air box Is used to provide a Collection area for the oil mist to drop out of suspension.
The oil is collected in a tube to be periodically drained

This system is inadequate
Even when empty some oil gets into the intake and causes deposits on the valves and combustion chamber identical to the black crust that develops on the outside of a cast iron frying pan yuck.
And if the oil level gets high it starts to muck things up fast
It also provides no vacuum for the crank case

I think it's far better to buy or make an oil mist separator that drains back into the motor and keeps all the oil out of the intake.
Yet still puts the blow by gasses back into the combustion chamber.
Attaching to the intake manifold not the air box also provides a good level of vacuum in the crank case. Good for the seals and actually provides for a more powerful stroke

A stock cam has very little valve overlap
Not so great for power generation but very efficient and clean
It also means you can alter the exhaust without needing to do much of any thing to the intake
On a stock cam all you have to do is keep up
with RPM×displacement
At very high intake demand it's good to be a little richer
As the carb gets a little lean at high volume

I am very tall so I end up sitting on the back or my knees bonk
The handlebars

I would hope the single shock is good and stiff
I tried using one shock on my 150 just playing around
But I just hit the bumper when I sat down

Nope, the full weight of the back half of the bike including the motor pushes straight down the shocks or shock into the rear wheel. The case of a single shock is the only functional need for the CVT cover as it's not balanced by an opposing shock
It supplies excellent torsional stiffness to resist the twisting
Of The Imbalance
Unless You are talking about a 50
Then I dont know