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INA199: Bulk Current Injection Support

Part Number: INA199

Hi team, 

We are currently using INA199 for our BMS Current Sense Application. 

The current sense resistor (0.1 milli ohm) is placed on the negative line ( between the overall pack negative and cell 0). Using a kelvin 4 connection, we are sensing the shunt current using INA199C, whose output is going to the microcontroller's ADC pin. 

During normal application ( Bulk Current, not injected), this setup works absolutely fine. But when a bulk current of around 60 mA ( 20 to 200 MHz) is injected along with a 50 A signal, the output is totally skewed with upto 100% error. 

How can this error be mitigated ? Looking for some tips with respect to layout, Rf and Cf selection etc. Thanks in Advance.