I was out the other night and bounced off a rock at the local jetty. I busted the center fin out of my 7'10" off the rack "big guy fish." So instead of getting out I surfed it for an hour or two as a twin fin. I noticed that is was way looser in the rear but actually more fun on the bigger sets. Someone suggested filling in the holes and buying some keel fins and riding it as a twin fin. Anyone see an issue with this or should I just replace the center fin? Thanks!