Yes, looks like per-phase power resolution is 1/10th of a Watt. Do you only have 2 of the 3 phases running to your property? If so, you might need to dig deeper to determine if the underlying IC used in that meter can cope with no connection on 1 phase. I vaguely recall some of the poly-phase ICs want all 3 phases wired - but don’t quote me on that, it’s a long time since I’ve looked at the poly-phase stuff. In the end, we went with 3x single phase ICs in the one box to gives us 3 phase capability.
I think you’re right. I haven’t had time to read the docs on your meter in depth, but if our assumptions are correct I think they’ve taken a very capable core metering system (with huge dynamic range and resolution) and then lost if all at the last minute with their UI soft register choices.
At the other extreme, I wanted to report energy in WattSeconds and wanted the result preserved for the life of the meter, so ended up going with 128-bit registers for that.
I think that was just the next page after your reference, so p16 I guess?