All I can really say is it's the fishery and proper management that have proven to be successful! It's pretty amazing to have a fishery where your average fish is 20" and it's not uncommon for anglers to catch 10+ fish in a day!
Because they're such a rarity and such an aggressive fish, fisheries knew that in order for the fishery to be successful, a no kill and no power boats regulation would have to be implemented. This has been the critical factor that has put the fishery on the map!
I was there a couple weeks ago and caught some of the larger fish as well, up to 26-inches, and some really nice males! Unfortunately on that trip I was by myself and was limited to my photos of fish. =S