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There is an error at the output due to the resistor matching. How can I minimize or eliminate this error?

I am using LTC6363 to convert my single-ended signal to the differential signal that my ADC requires.  I have the amplifier configured in a gain of 1 and have discovered that the gain-setting resistors dominate my CMRR performance.  Because of the way the amplifier’s input common-mode voltage is modulating in my circuit, this is creating an error at the output due to the resistor matching.