If your problem is only at very very light throttle, then i think youl finds its normal for the CC1410 motors, mine does it but i hardly notice it as i never really drive at very light throttle, youl find being a 4-pole motor also adds to this problem i reckon...Once you run it few times youl probably think its ok..

Also ive read alot of guys think the version 1.26 software is the pick..