After the beach cleanup today at San Gregorio Beach, I have surfed there for a bit. I am drying out the Fish to get the tail filled so I used the 7'0 which I do not take it out usually. This is still such a difficult board to paddle and ride, even though it is 4 inches longer than my fish, it is about half as stable as the fish.
The width of the board really matters quite a bit in the stability! In a quick ellipitical computaion, one inch addition in the width have made about 8 inch difference in the length in terms of the surface area.