"If the surfer is riding a board larger than the recommended size, then the fin would need to be moved ahead of 8.5" from the tail. And if they are lighter weight, move towards the tail."

Rich's comment is a bit confusing to me. I would assume that if the board is larger than recommended size then the rider is lighter weight. I'm riding a 9'4 Banana and I'm 150 in the summer or 160 with my winter New England gear on. At both of these weights I'm a little lighter than recommended for the 9'4". Should I move the fin forward or back?

Thanks, Mike