When you said "what pairs are twisted," I saw no connection between that and "how much they are twisted."

They vary in twists per inch, and they only vary by as much as is required to meet the crosstalk spec.

As the amount of twists increases, the actual length of the pair increases, so adding more twists delays propagation differently per pair... so the more twists, the better the crosstalk spec, and the fewer twists, the better the time alignment of the four sets of signals... so a balance must be struck between a better crosstalk spec and a better time alignment spec.

The reason that twists vary from manufacturer to manufacturer is that a performance spec must be met regardless of color and there's no master spec god telling everybody what color must have most, what the least, etc twists per inch.

Going back to our Aussie friend, better performance as 568A than as 568B implies that the wire is being used at the extremes as its spec, for more than 100 meters in length.