Using 4/0 owner circle hooks through a green backs nose I've found the hook point tends to shift and foul hook the lower jaw reducing live time and natural action of the bait. Even with large greenbacks this often occurs. Could switch to a smaller hook but it may reduce hookups with less circle hook. 4/0 owner live bait j hooks seem physically smaller than the circles of the same size. I have less issues with the js.
To resolve the hook from going back into the fish I will try putting an owner glow beed on the hook to restrict the hook from re hooking the bait. Seen some folks use chopped rubber bands for live bait bass fishing.
Here is a link
http://chasintailtv.com/articles/how...-on-your-hooks