Besides, a simple comparison between the tosafos and chachmei sefard, demonstrates that their discrepancies are not largely errors of copyists. There is an obvious difference of origin.
And, an examination of the sparse writings of the early Geonim, points to there being no standard wording. The BeHag had completely different versions than any manuscript that was ever known in Europe. It is laughable to suggest that there were such major errors that crept in go just a few hundred years. And that they were then completely resolve in a comparable amount of time. But yet the BeHag, writing an early halachic compendium, was unaware of these mistakes.