I would be stepping your hook size up, and once I swapped to gamakatsu hooks my hookup rate improved dramatically compared to the old mustards i used to use, just a couple of things to consider and i know its difficult but once you have the fish to the side of the boat don't allow any slack line to form and have the drag set correctly try and swim/guide the fish into net with the rod and get yourself the biggest net possible to make things easier.. sounds easy ey
either that or if he's big enough you may have a better shot with the gaff
but I think step up your terminal tackle a bit and if your getting reefed you may have to try and hurt the fish a bit more at the beginning