Drone is unstable with payload(Agricultural tank)

I have developed 10L agricultural spraying tank, without payload it flies well, but as soon as i put 10 liter load it oscillates a lot. But irrespective of payload, drone flies really well with autonomous flight. Can anybody suggest me the reason for that
Thanks in advance

Which flight controller you are using???

We need a .bin flight log of both load conditions.

Just a thought, but does your tank have baffles? Sloshing liquid can be an issue.

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