Yeah, i noticed the very same.
You can see it in my movie of the
crawling revo.
The mamba maxx seems to do this to act smoother. and it works.
the mamba-maxx doesn't start at 2 rpm, it has a limit of several rpm's per minute. (to produce the needed EMF for sensorless) after it reached the starting RPM range, it can go lower. it's a neat trick to prevent cogging IMO..