Remi - Deb? Stiffness?
I have bought 30cm & 34cm SL4s for 2009 ISonic 94, 86 & W53.
What rigidity are you using - rigidity NR 2 - stiff or flexible - rigidity 1?
What differnce is there betweeen them when sailing? On flat water or chop, square or broad, overpowered?
Have you tested the SL5 any more against SL4i when is one better than the other?