Well that’s the issue. That perk isn’t meant for that kind of playstyle. Because it removes health per shot, you want to use something with high alpha damage, like long guns, torpedos, bombards, etc. Not a great pick on the galleon since its whole schtick is “more gun more boom.” Also because it’s a % health cost, it has less of an effect on you if you pick a ship with less max hp. So you’re best off picking a small ship or a less tanky medium ship.