Longshank hooks would be no good for trevally. Great for whiting but the bend in the hook is too small in diameter for a big trev! 50cm plus trevally, I'd be using a 2/0 or 3/0 circle for sure! As mentioned they go hard especially at that size. It's easy to get excited and try over playing the fish. As mentioned, just take your time and enjoy the fight. Oh also, if your not using circles, when you get the take, make sure you set the hook.
Cheers scratchie!!!