I have the exact same issue with my car (dex210) when you roll it on the bench, not quiet as loud as yours but basically the same thing. I never noticed the issue untill I changed the motor, I had a new hpi flux 6.5 which didn't do the stepping thing, but wanted to try a different brand to compare power as the hpi seemed a little flat , so bought a used Lrp x12 off of the for sale section on here and ever since has had the same stepping issue same as yours. No real problems when running though.
It's definitely the motor that is the difference but the motor is unbelievably quick compared to the hpi and is the same turn. The only thing I thought it could be is that the person I bought the motor off advanced the timing on the motor and overheated it and damaged the motor magnets or/ and armature causing the problem.
When the car runs, it is too quick really and runs quiet hot so could be that, and on the straight I am sure on a least one occasion it stuttered, also noticed that where the sensor wire goes in the motor was a little loose although that would only be a problem when the car is turned on, not tried running the motor out of the car but will do while it's in bits.
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