You should be plenty fine with a number 4 Chuck, its the same hook we use for 40 lb King Mackerel here lol, but its also the same hook we always replaced the stock hooks on a Bang-O-Lure, the 4 Excalibur TX3, but without the dressing on it. Nice little fish there on the rooster, looks like the hooks are working well.
Good Luck,
Brent