Stehar,I would never question,what. Any surfer loves,and I'm stoked for you,especially taking into account your on going knee problems,however I'm curious about the drag that comes from the toe angle of the 4 bonza fins on there own? I know this design,and it's dynamic ,with extreme concave and flattish rocker,makes for a very fast design,I know you love Quads,but have you/will you try it as a single fin,so as to minimise the drag of the bonza fins,if this is about speed and flow for you.Disclaimer!I have only ridden the 8.4bonza and not the longer version and found it to go well as designed with the 5 fin bonza set up,again congratulations ,on first of all your patience and perseverance I'm looking forward to your research feed back