LTC4020 Unstable Operation

I want to charge 6S 27Ah LIPO battery pack.

The charge current is 15A. Input voltage is 12V and output voltage is 25.2V.

I am using the same compensation values for ITH and VC with DC2134A eval board.

The thing is, when the battery voltage is low there is no problem i can charge the battery with 15A.

But when the voltage reaches 25.1V charge current became un stable and ripples occuring at the charge current.

So i change the compensation values the circuit works at 25.1 battery voltage but at this compensation values can not work at 22V battery voltage.

I attached the schematics. Hope you can help me.


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