I think you'll find that there is a palpable divide between those that believe as you do (that clothes should 'fix' one's body shape), and those who would rather make the most of their natural eccentricities. Now, as big-headed as I am (both physically and literally), I may simply prefer the latter because the former would be less effective personally. But don't you think hard formulas and ratios are a bit too reductive?
Menswear should abide to those reductive rules, including hard formulas and ratios, while seeking individualism from minor details, IMHO. Majorities of us were not born as models with perfect physics thus it should be imperative to use visual illusions to fix our deficiencies. Carefully tailored clothing will appear natural regardless but not necessarily pleasing in appearance.
Or you could always go out of bounds like the OP.
Pardon my language but it should actually be golden ratio 'reversed'. Golden ratio is approximately 4:6 width to length, upper to lower body, etc.