I,m not an expert and lighter (90kg), rented the 8.5 at Fuerte and I could barely paddle on it.
In 45min I did catch 2 waves due pure luck.
I did swim and fell in more as standing on it, never felt comfortable.
Changed the board to a Hokua9.3 wich felt immediately like my own board but better in the Surf.
After a long doubt I commited to a few weeks of Pasta, bread and peanut butter only ;) and bought today a 2th hand Hokua9.0 that looks like new except one easy to repair ding.
Its just a tad wider and 8l more volume as the 8.5 but that makes a big diff!
Naish stated on the website that they are bassicly the same boards, but modified to suit different weights, seen them together it makes sense to me. They look almost identical (the 9.0 a tad more gunnier), both small and as true rippers.
Also something to keep in mind is that a Naish feels always a bit lower as quoted while Starboards have more volume as quoted.
I don,t know about the SUP,s but a 81l windsurfboard from Starboard is in real always a 3-5l more.
Thats no problem at all when you stay with one brand, but if you switch, one 125l board can be a lot smaller as another 125l ;)
Now if that white stuff we call snow and ice can dissapear, the teprature changes from minus7 till+ and a bit of swell come in I can try my new part of the family