Yes Icarus, that's a fair point. I had to re-read my previous post to realise that it was missing the final couple of paras. I wrote the whole thing in Notepad, then did a cut and paste but, somehow, I missed the last two paras. Doh!
They were the ones that explained that, while all of the above was the theory, I'd only posted it by way of getting to the point about turning thru more or less than 180 degrees. Then a quick discussion of why the 3-times WCA technique works well and is, in fact, a bit of overkill in a one-minute pattern.
It's not a serious problem in such a short pattern, but I wouldn't use such a drastic drift correction angle in a longer holding pattern, or a racetrack approach procedure, where outbound timing can be up to 3 minutes or more. There's a greater risk of straying outside the primary protection area in such cases.