I had a carbon copy of your mistake on that leg
Routegadget is helping me understand ,...
http://garingal.com.au/gadget2014/cgi-bin/reitti.c... - Looks like I failed to get on top of the ridge line before the control and completely ignored my compass.
Sounds familiar. I didn't drift as far right as you however but certainly ignored my compass!
You have to love a long distance race that has the same winning time as the middle distance the previous day!