I'd go with the mono over the braid,Topsailbum.. Reason: A hook can easily be pulled will fighting a king mack,braids have no streach,so every turn of the head the king makes could tear the hook outta him.. Kings are foul hooked more often than most fish caught on live bait,I think it is because of the way they slash at a bait.. I think mono with it's streach does a better job of cushioning,therefore less pulled hooks..

As far as line test,I'd use 50 shock,20ft of it.. For running line I would use 20 some folks use 30,IMHO think it to be overkill..