easiest way to understand kv ratings is this: ignore them.

too many factors in producing the numbers (voltage used, timing used, load used etc) for them to be of any use.
Compound that with dynamic timing speedos which increase rpm, and kv is even more meaningless than before.
One thought for the group here... many many pages of people talking software, firmware, motors, kv and not a single actual setup other than those posted by cherry !