marco gribi said..
7'10 x 30 - Less stable than the 8'5 Pro for me but a bag full of performance and sheer fun. This model should be the most suited to the conditions you mention and as you are 10+ kg lighter than me might be more stable than the 8'5 (I have had lighter people say it felt more stable). I cannot rave any more about this board, I just wish I was your weight to use it more often. I do get tired quicker in the legs with all the extra balancing.
Very interesting comment re. the comparative stability of the 8'5" Pro and 7'10" x 30" Airborn, with heavier riders saying the Airborn is less stable, but lighter riders thinking its more stable. And I think it's spot on and very true!
When I first got my Airborn, I thought it felt slightly less stable than my 8'5" Pro (have a look at my first impressions described above). Standing in calm/flat water the deck was above the water, but once moving, there was generally about 1cm of water splashing over the deck, so although it 'floated' me, at 82-83kg I was probably nearing its weight limit (for anything less than pro riders), and the widest point on the rails was submerged.
In the six and a bit weeks since getting this board, I've dropped a reasonable amount of weight, and now at 75-76kg, IMO the Airborn is undoubtedly more stable than the 8'5" Pro by comparison.
Previously, when the deck was just underwater/on the water line, the float of the board would have had a significant bearing on its overall stability. When there is water pressure on top of the rails (even if not a huge amount) rather than just from underneath, the whole hydrodynamics of how the board moves through the water changes.
Now that the board sits a little higher in the water for me, and the widest point on the rails is not submerged, the stability is governed more so by the width of the board, which, being 1" wider than the 8'5" Pro makes it feel more stable.
I'd be guessing the pivot point for float vs. width in governing the overall stability of the 7'10" x 30" Airborn is around 77kg.
So IWB, my guess is that you (being almost 10kg lighter than me) would find the 30" model significantly more stable than the 8'5" Pro.
I haven't had the opportunity to try the 31.5" wide Airborn for a comparison, but would be guessing that the increased width would only make it more stable, particularly for lighter weight paddlers when the rails aren't submerged.
So as Marco said, the 31.5" would probably offer you the most stability compared to the 8'5"Pro, but at your weight, I wouldn't dismiss the 30" model if you can find a way to Demo both.
Cheers,
Ali