Their teeth must have got a lot sharper and jaws stronger in the last 25-30 yrs .
Never jigged for them, but a fat garfish, scad, juvy shark Mackeral or rainbow runner at 60 - 80 ft on the downrigger was to a doggy like ice cream to a kid. Used to fish for them with a bunch of mates. 135-150 lb soft s/s mono on 24 and 150-175 on 37kg depending on bait and hook size. Don't ever recall a bite-off, and a mate got some real big ones as he used to fish for them a lot.
This mono/single strand stuff wouldn't work so well on a jig I guess, but might give you an idea on what you need to prevent bite offs.
Cheers
Brendon