Found this thread while poking around...We are borrowing a standard (not the 2/4 or 4/8) from one of our club members...and he doesn't know the answer.
Is the reference for traction or for trick flying? I also noticed that the upper connection on the white bridal line are also adjustable, or is that just my imagination?
I've not actually used it at all since I got it - partly due to strongish winds and lack of time. Hopefully this year I can find the time to fly it inbetween other things. Let me know how you get on with it. Good Luck.