Great! I think I'm getting the idea... progressively of course :-)
Now I've had my absolutely best windsurfing session. Wind was nice, I was planing and it felt easy and as if I was in control what was happening there (thanks to this sentence, I'll be swimming next time...). No catapults or other difficulties with harness. This time I had 8,0 NCX.
I guess I won't need my 6,5 sail for a while. Maybe it needs so much wind to get Rio S planing with that sail (and my weight 60 kg) that I prefer to stay indoors those days.
Thank you for your advice, all this has been very helpful. I do appreciate that you answered so quickly, always before I had a chance to go and test your tips in practise. Now I think I have enough home work for this summer :-)