I've got a 07 21v. I have tried to surf a couple of times this spring, but have not been very successful. I am running 650 in the rear surf side and 1180 center sac filled as full as the locker will allow (probably 900-1000). We are using a 5' 4" Ronix Cortez. I have never surfed before, so that is probably part of the problem. It just seems like the wave has no push behing it. I can't seem to get the rope to slack off completely.