One of the things that I am most interested in is all out speed. I see these racers just hauling ass with the boards almost floating over the chop. I attribute this to the amount of fin and the sector just doesnt have that much fin to get it to foil out of the water.
Do u think this would be a good entry board for what I am after?
I have a 2011 183x59 Cabrinha board. With the original fins (2x26 cm fronts and 2x24 cm rear fins) there wasn't enough fin to keep the board completely flat, even if I put as much weight as possible on my toes.
Recently, I purchased a used set of Rista fins for a 65 cm quad board (2x37.5 cm fronts and 2x33.5 cm rear fins). These fins are a little too big for this board I think, but it is much easier to ride flat now, and the board foils up out of the water much more. With the existing fins on the Naish Venturi, I don't know if you will get the foil effect you are after.
As far as all out speed on a reach, I don't think going to the bigger fins made the board faster on a reach. It definitely points much better upwind, and I can sail with speed at a lower angle downwind (I think), but top speed isn't any better.