retreat

You could, you know run dodge ninjas.

Use MM on Water Main, and he doesn't need to be P1.

Then you can run Shisui and Minato Jonin.

Usually in this team water main uses pakkun to get rid of dodges before using shark bomb so even with dodge you are doomed, higher ini is the only solution i know

About the chaos carrying to the next round, it really depends on how high the opponents' control stat is. The higher it is compared to yours, the debuff won't carry. I tried it out with weaker and stronger players than me to see the difference.

best team to counter shark bomb : KCM+Kushina red + Edo roshi

you can consider running fire main + clone using his 3rd standard attack, in pos4, specifically to target water main after all the standard attacks in the round. i managed to keep a chokehold on water-han-kure-gakido until round 4 while losing pos1 ini with that. only lost in the end cos i just couldn't do enough damage to kill their healers before time ran out.

the team i was using: JM-shark-ay3-fire. ay3 can be swapped for anyone that controls on chase tbh

well dodger can be handy in this matter for shark bomb.

or kurenai passive for counter chaos.

an for double healers,its hard to tell who's you are reffering to, since healer like normal kabuto or normal sakura or shizune which are not matter at all.but for A++ im assuming that's sailor sakura with water main. then mostly they will use poison attack not the experiment talent. so which cancer water type that you are reffering? its the poisons or the chaos.if they use han with water main and sailor sakura than mostly they will go with poison type, which mean the main its self are not on pos 1 majority, maybe on pos 2. so there are no reason for ur pos1 cant lock her down and canceling the shark bomb with acupunture/immobile in build pos 1 mystery or from ur line up chases.unless... your bp gap are too wide.hope that clearing thing a bit.