Just to let you know and counteract confusion for others:
For a single Li-Ion cell configuration (1x 18650 or 1x 18350) the limit is 17w at level 28.
The NXS R1 programmer shows levels up to 31 (23w) for single Li-Ion cell configuration
but they will be internally converted to 17w at level 28 when programmed.
See my question about the same thing here at post #221 and ElectronGuru's answer at the following post #222 (please read his answer completely).
It is also mentioned in the upper right hand corner of the NXS R1 programming page.