Hey Paul hope all is well!
Just wanted to share some footage of myself on a recent trip down in baja riding a 9" nail fin in a 7' hull my friend zak klein made for me. The board is stringerless eps, extremely flat rocker and convex through the tail. I loved the way the nail fin felt. I'm short and sturdy and it never felt over flexed when pushing hard like some other fins I have used.
At the end of the video I am riding a 4th gear flyer standard mat.
Hope you enjoy and feel free to post anywhere if you want to