I have done a Q&A thread at the Swedish forum and let Anders Bringdal (part 1-7), Antoine (part 9), and Patrick D (part 8) answer the questions.
And now I have made the effort to try to translate episode 1 into english. Is anyone interested to see 2-7 with subtitles?
(About boom height, board trim canal vs choppy water, speedkites & boats vs windsurf etc)