That's unsurprising.
I'm not aware of even a folklore-strewn POH that has that 'technique' in it.
Millions of hours of operation of a simple machine designed in the 1940s and still the fertile soil of folklore sprouts new stuff.
Best thing you can do M1M: Fly aircraft with an all-cylinder engine monitor and do some research to understand the implications of the information it's presenting to you.