ThankYou for quick answers!
My weight is 77 kg. I have a set-up with the boom up to my chin and the mastfoot back. I try to sail aggressiv with a lot of pressure through chops
I also have an TR 4, 9.2, that I normally use on th JP SLW. I will try it next time on 127.
Interesting with the remark on the S 10-fins. I suppose I will keep them as I now know they can be as that fast.