Use gaara in sakura place and use the healing setup for azure fang, if you have it unlocked, i don't remember if at your level regenerative healing jutsu is available. Otherwise use iruka in sakura place, since boosts both your main, sasuke and kushina damage, and put him in prompt move 2 and kushina in 1. I would use poison cloud over shark bomb since surely you still don't have neurotoxin and poison tai unlocked and since poison is always annoying and switch to regenerative healing jutsu as soon as you unlock it.

Shark bomb don't add much without neurotoxin and you have sasuke mystery and kushina standard/mystery as combo starters, so you don't really need a 3rd starter. Poison over two rounds will surely hurt more than the effect of shark bomb.