I have to say a few pages on the report contained operational errors...
The increase in speed control on final was probably due to the fact that crews who flew them were probably in the 'more competant' category and not for any other factor. The fact that as Gonzo stated above it was more like a 3.1 degree trial probably negated that point anyhow! Some of the fleets mentioned in the report don't deploy gear based on altitude, but do so on the DME reading. An RNAV approach isn't a CAT I approach, and you need considerably more than 550m visibility to fly it!