I was taught Latin prose composition in a way that is now almost forgotten. There were many tricks of the trade to be acquired, including such basic rules as correctly sequencing tenses; most of these could be found in the primers and study guides — as they can be still — and one of these was how to change emphasis by altering word order, which apparently underlies your question. (In the end, however, it was considered that the only way to write with good style was to develop one's own — and that could be done only by reading widely, in just the same way as one's style of English could be developed.)
Your query seems to suggest that you are looking for rules of word-order that could be applied to prose composition. Given the vast quantity and variety of source material, that is formidably difficult. I can readily understand your wish for statistical information but, even if examples could be gathered, how would we know that they represent accurately the population from which they were drawn? And what might that population be? We might think that in Caesar's 'diaries' (rejecting those books of which his own authorship is doubted), we would be analysing just a single person's style: but there are quite a few passages which are very obviously not his own and have probably been interpolated from elsewhere. How much of such material was included with Caesar's approval? Where should we draw the line for acceptance?
Then there is the probability that even a single writer's style depends on the circumstances under which he is writing. For the works of Cicero we can be comfortably, if not completely sure that he is genuinely the author, but familiarity gained by reading selections of his works reveals that his style (like that of most people) depends on the subject and the mood of the writer. For example, the measured periods of the forensic speeches are not at all the same thing as his personal correspondence. Do we know that Tiro's copies accurately reflect his master's originals — or was he allowed, or even instructed, to make changes for stylistic effect? Perhaps; but how much 'correction' has been applied by copyists and grammarians in the process of preserving his works in a 'consistent' style? And that, of course, applies not only to Cicero's, but to all texts that survive to the present day; and not only to the syntax to which your query applies, but to the accidence.
Returning to your question, how would you expect the statistical data be presented? Maybe you have in mind a way in which the six permutations of [SOV] can be related to purpose, style, etc. for some particular set of authors, by some kind of multivariate analysis. That would indeed be a formidable, indeed virtually impossible, task if it were done in the way of nineteenth-century grammarians — but indeed, how very interesting! I think it would be a big surprise, but let's hope that someone can come up with a sound analysis.
