Hi Drew. We rewalked and updated this route last week, hence the new version. If you can still see the old version of the walk somewhere then please let us know where, as it shouldn't be available anywhere. Thanks for the help!
At end of para 5, there is actually a right turn - you can see it on the 1:25k map under the C of Craig Gowan - and I've got photo notes of each turning which I've double checked. The left turn (that eventually leads to Princess Alice's cairn) is at the start of the next paragraph, so it sounds like you kept right here.