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INA129: CMRR problem with a buffer on VIN+

Part Number: INA129

Customer's circuit is as bellow and they care the CMRR most.

The test input is VCM=10V@10Hz, VDIFF=100uV@10Hz.

While input from INS+ and INS-, CMRR>119dB;    but from IN+ and IN-, CMRR<80dB.

Customer's requirement is how to make CMRR>110dB while input from IN+ & IN-.

Thank you and happy new year!

Marc