I would check PSRR vs. frequency in AC analysis and run Monte Carlo mismatch. They can screw PSRR, but I don't see problem with your setup. I just don't understand why you call the vcvs output as 'outcm'. It should be a differential output, not a common mode.
The sign of your rejection is not so good, however lots of the engineers calculates PSRR with negative sign in dB. I think it is wrong, because the "Rejection" of supply noise should be high as possible, so I prefer the positive dB values.
From same reason for CMRR I would calculate it as CMRR = Au_diff/Au_cm = Au_diff_dB - Au_cm_dB