A few Fiji locals on this forum who hopefully will chime in. Notably Sachin who is very knowlegable and fishes this area a fair bit.
I'm very fond of Kadavu and Ono, (well Fiji as a whole) though haven't fished there for a few years. Popping and jigging should be pretty reliable. I know the pelagic action offshore has taken a hit from foreign longliner fleets allowed to smash the $hit out of it.
For you based in Suva you could also do day trips out of the Coral Coast, speak to Danny @ Mango Bay resort & he could fit you on with a group if need be.
Cheers Dave