Hey!
A few tips.
Check
www.foils.nl/phpbb2/ for detailed info. There have been detailed kite nerd discussions for the past year about all aspects of the Speed.
As you get up towards 20 knots you're going to need to edge hard to kill power in the kite, to force it towards the edge. Like your bow it likes to fly fast, I usually have the trimmer in just a bit. Try not to crash leading edge straight down. When relaunching downwind you can slow the kite down by sheeting in or powering up. It takes a different technique when jumping, again, check foilzone. Also look at the ways described to pack and unpack the kite, follow a few simple rules and you shouldn't get tangles. Remember to do up the zips. Clean the pulleys every few sessions.
Take it easy to start with, I find 15 knots average about ideal. In light wind if you can build up a bit of speed, apparent wind, you should find a bit more power.
Have fun! Hope you get some decent wind!