When I had my Yak I use to use a 10 foot 8 weight, using the idea that one would want a longer rod as you sit actually below the water-line. Build my own rods using oversize guides, use a nail knot leader to line. The leader goes through the tiptop easily. The only problem I had was fish going underneath the Yak. Just my thoughts.
I am now having a ball with my inflatable, gone out through the surf with no problem, had some good fishing every time I have gone. It is still wet returning to the shore.