The LSV can handle quite a bit of weight. The locker is a little small for the Fly High Center Gravity Games Sac.
I was in one today at Active Water Sports and I noticed that underneath the bow seating will fit a Fly High Integrated Bow Sac. You wont be able to get the full weight out of it but you can easily add it to your factory ballast system. After you add more weight to the bow, add the Fly High gravity Games Rear sacs to the V-Drive compartments. If you want to ride at 80' that should give you an awesome wake at that length.
You might need to add a tube sac to the walk way which would be rad because you could put it on top or under one of the seats when wake surfing.