The pure of ink saver sub allows me to throw 2 fizzy bombs without going back into my ink with a full ink tank. The main of quick respawn is self-explanatory. Considering how far fizzy bombs go at level 3, the 2 subs of sub power up can apply pressure to back liners. The 1 sub of swim speed can be useful but you can use another sub of quick respawn or sub power up. The stealth jump, 2 subs of quick super jump, and the sub of special saver are all self-explanatory.