powered up/booted.. Im at a constant 61.4 (DCA setting on meter is @ 200m)
(this is without any audio playing...or the motor being jogged/pulsed)
playing a simple audio track (without motor) shows me at around 74 range (tops)
motor with audio shows me at around: (no more than 185 ever).. thats with constant interaction: audio and motor spinning/jogging/pulsing..
Those look perfectly reasonable figures to me.
Personally I would get two very small value capacitors - say 10 to 100nF - and connect them to the motor. Connect one from the motor + terminal to the body of the motor, and the other from the motor - terminal to the body of the motor.