I discussed this in my blog:
http://www.iceblogger5219.blogspot.com/ on a few different posts. All of us were scratching our heads trying to figure out how these tiny runners could be the top choice in only 1/4"-1/2" of snow - and even in a wide wind range. I felt that this might have been a "once a decade" condition, but the same scenario repeated itself in Germany later that week during tune ups on Lake Zwischenahn.
Ron has some very good hypothesis on the whys and hows of this unusual runner set up. I believe he will have a posting soon on his website, but have patience - as we are all trying to get caught up on rest and work having just returned last night.