Each to their own. I dont believe most of the crap thats on here, nor do i take everything i get told by workshops as gospel. My opinion only. I dont expect anyone on here to believe what i write, for all they know i might be 13 and own a pushbike and nothing else, and have never worked on a car.
What works in/on one engine may not work on/in another. Trial and error is the only way you know what works and what doesnt. Just sucks its so expensive and time consuming. Power figures are just a number, you can make the dyno read whatever. As long as your happy with how it goes who gives a fk!