Pete
I got a black marlin of 110kg on a jig a couple of years ago on the 55fm line out of the Goldy and subsequently tried to target them on jigs after that. We had several hits fishing large bait schools but no solid hook ups, some of the jigs where actually bent from being hit by the fish's bill. A fast sinking stickbait may well be a viable option but there will be a lot of casting involved to get bit. We had one around 300lb chase a stick bait on 3 successive casts out on charter while I was guiding with Nomad at Frederick Reef but failed to eat the lure. It is definately a maybe.
Regards
Rod