Thank you all.
Now I laugh at myself for I've posted such a thread,because I would give exactly the same comments if it weren't me but someone else posted this thread.With the excitement of testing a new board (and not an ordinary board but legendary IS

) I seem to forget the simple basics

))
It's expected 17-20 kts tomorrow.I plan to test the board with 7.5 sail and 42-44-46 fins.I am now definitely sure my new boy will do a lot better.
Though the first test was a lot of frustration and struggle,I must admit that riding the IS was a different and exciting experience.It seems I will order an IS 101 very soon

)