Why do so many sonnets break in line eight, if the golden ratio is 8:5. If you were really adhering to that, wouldn’t you want the break (stanza-break or visual line-break) to occur half-way line 9, and not line 8—while still perhaps presenting a volta in line 8 or in the split (think "The World Is Too Much With Us" for example)? The 8.5:5.5 is a lot close to the golden mean, and I think some of the Romantic sonnets exhibit it, but can only think of some Keats and Wordsworth as examples write now. "The World Is Too Much" is the best example, as it breaks via dash halfway down the first line of the sestet, while still preserving the volta on either end of the line. Also, more contemporary, Denis’ Johnson’s poem “Heat” (both of these available online) breaks similarly in line 9.
Can anyone think of other sonnets that break after the end of the octet, and still have a volta? Or that conform to the golden mean? Or just unusual sonnet structures in general, or comments on any of this? Curious to hear what people think about the golden mean and volta ideas.