Figured on my Ace playthrough I'd use some of the more advanced bombs like SFFS or an SOD to keep the land battleship's deck clear (especially of the airburst guns), but I noticed that they were doing almost no damage at all. This also held for XSDBs and UGBLs. Whereas SFFS made the third Land Battleship fight a cakewalk since I could wipe out all the heat vents at once - despite the ship still moving, just like the first one. Trying to figure this out since maybe I can get away with 6AGMs on my next run.