Look at why you are adding each ninja.

Why tenten at pos 4? Is she just there to buff crit, or do you want her to dps? If its crit because you are struggling to proc chaos maybe water blitz isn't good for your stats. Is Mabui just there to let you use tenten round 1? If so tenten shouldn't be pos 4 she should be higher. Is mabui there for anything other than chakra?

I'd try and buff up water main all you can, get a water barrier like Mei, maybe add iruka to buff mains damage. Maybe add a healer like kurenai or gakido that can make sure water main isn't controlled going into round 2.

You need to try and focus one thing, build your team around 1 premise, if its water blitz, everything should be focused on that round 2 shark bomb, you team lives or dies by it so buff it all you can, and drop anything that doesn't. If you try too many things, like adding shira, none of the individual parts will be strong enough.

Look up some kawa vids online, he was the master of shark bomb cheese.