Using AD7401A with SINC4 Filter with Decimation Factor 128?

In order to increase the bandwitdh and the SNR of the acquired data we would like to use a SINC4 Filter with a decimation factor 128 instead of a SINC3 Filter with a decimation factor 256. With these measures we hope to increase the bandwidth to 150 kHz while still retaining a SNR > 80 dB.

Does this make sense with the AD7401A or are we missing something? What SNR would you expect?

Thanks a lot for your help

Bernd