You can change the deviation to 50 kHz. Since the deviation is lowered you can also change the RX filter BW to 406 kHz. or even 325 kHz if you have a fairly tight crystal tolerance.
Table 25.16 is measured as follows. An RF signal generator is used as signal source. The CS flag is monitored. For each gain setting (LNA and DVGA) the signal generator level is increased until the CS flag gets asserted.