Fantom Ion 17.5 Turn Brushless on 4s Lipo

[MetalMan]

I have mine geared a bit higher, and even on Smart Sense it would cog in the mid-range pretty badly if given enough throttle quick enough. Maybe it's because it has switched over to sensorless at that point and there's not enough back-EMF with the load?
In sensored only mode there is no cogging at all but the motor ran hotter... gotta love dynamic timing.