So today I've tested the new Infinity B-Line 7'11 x 27'' with 85,4 liters.
I weight 70kg and usually ride board around 95 liters, although I have been riding boards just over 100 liters for the last year and a half. The smallest board I've tried was a 7'4 with the same volume as the B-Line (I needed to keep the board moving to stand up, keep paddling not to fall and the tail was always deep in the water and the nose way high).
So I did this video
www.facebook.com/SUPnorte/videos/1242939045803733/ today where I tested it during a (rare) flat spell in Portugal. The board was super stable right from the beginning (as you see on the video). Easy to paddle (and feeling fast) both with side-wind and upwind (the wind was light to moderate from side-off to off-shore, with little to non existent chop). There were some ankle high waves that I caught easily and I coul accelerate the board easily).
I was a bit wary when I've ordered the board since it had such low volume and really thin rails, but I felt that stability wise it was similar to a board around 100 liters. So now I'm thinking I should have gone smaller! I'm already eyeing the 7'7 x 26" (78.8 liters)

PS: I'm a Infinity, SIC and Starboard dealer in Portugal (and I like to ride high-quality boards...)