Just curious because Im trying to connect things Ive experienced in servo development world with the information i read on boards about motor control in RC. Im sure there are differeing opinions, miscommunication, and good info but my intentions are good so please share what you know and dont expect a beating from me.

People speak (or type) of smooth motor or ESC combinations. im trying to understand smooth. Or in this case ROUGH.

is it low RPM bumpiness or cogging?
is it a hot spot or a dead spot where acceleration doesnt feel linear with the slope before or after the bump?
Is it the transition from 1 velocity to another with the trigger?

i ask because in my non-rc experience the problem can be in the hardware but can be minimized or resolved by 3 different methods on the same hardware. potentially eliminating the problem altogether.