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Old 26th July 2021
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That's exactly all I have seen period regarding oil tank level...… because it works.
No other reason.
But you are allowing less cooling factor when lowering oil so there is a drawback to that practice.

Lower oil level=less oil in the sump to be picked up into suspension to rise out the breather?
Maybe check for pinched vent line or some rubber hoses can either implode or shrink inside, lowering flow.
Maybe check to see if you have more blowby = compression check.
Maybe check crankcase pressure to see if you have too much vacuum.
Vacuum helps pull oil in suspension in the crankcase.
Maybe check the rocker cover bolts/gaskets for leaks.
Oil can get out but air can get in.
I can maybe this for a couple pages.
But none of that is usually considered by most.

That's why I consider lowering the tank and others as bandaids.
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