iSonic 76 vs iSonic 86

Hi,

I have a iSonic 101 (usually used on 7.3 slalom sail) and I'm looking for a smaller high wind slalom board (slalom sails 5.3 to 6.3).
I'm 1.75 for 68kg and racing since 8 years (slalom and formula). I also love long distance races. I sail both in choppy and flat waters.

Which board would you recommend ? iSonic 76 or 86 ?

I'd like to get advise from someone who has tried both.

Thanks in advance.

Roby