hey mate,
I too have been looking around for a charter in Fiji. i am traveling in early December and have sent some requests for availability to 4 skippers just last night, however i will be staying at the Intercontinental on the main island. The one that Stands out for me would have to be Adrenalin Game fishing - Port Denarau Marina. I once watched Paul from I FISH TV do a couple of episodes in Fiji on his shark cat but looking on his web site he may have updated his boat, Maybe give him a go.
Good luck