DRV8214EVM: Sensorless Position Measurement and IPROPI

Tool/software:

Hi All, 

I am evaluating the above IC for sensorless position control of a small (8mmx16mm size coreless) brushed motor, which is coupled to a planetary gearbox.

I am strugling to get reliable position control, with the reported number of counts changing dramatically based on load. 

I am also seeing a lot of noise on IPROPI. 

The EVM is in its factory state, with no modifications. VM is 3V, motor current is below 100mA

IPROPI and RC_OUT waveforms, EC enabled:

As above, but with EC disabled:

Any advice would be greatly appreciated.