Another recommendation, I can highly recommend Coral Sea Sportfishing Safaris out of Cairns.
Captain is experienced and has worked with Nomad.
Boat is purpose built for sportfishing and take you out to the edges of the GBR (we launched from Port Douglas and one one day, did not end up far from the Quicksilver diving platform at Agincourt).
Saltiga Dogfight reels and Wilson Venom rods with Nomad lures as hire gear if you didn't have your own.
Best of all, friendly on the wallet.
Not affiliated in any way, just had a great experience.