I would go with the Defense (2316) one since I feel like hitting a defensive breakpoint will save you a lot more hitpoints than one HP IV which may or may not give you 1 extra Hitpoint.
Kyogre is still around for awhile. Why not continue to try? I caught my best one today after lots of Kyogre raids (93% 15 attack), but then caught a 98% (14 HP) immediately after.