Well, IMO it doesn't look too shabby...
The pacing untill the Brakes doesn't really let up, and the part between the MCBR and the brakes is just there for a higher capacity, and to connect the two brakes... Like on dessert race (heide park).
Also, the "rattle" is not really noticable, except on that POV, where the camera is placed on the zero car, which might not be as stable as the other parts of the train (seats). Watch the backwards POV...
And for the headbanging: well, there are lateral and rotational forces present in fast transitions, which do that...