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I think it's a combination of high torque (Ninco motors are very torquey), slightly weak chassis, and loose bushings/motor. Glue everything down (bushings and motor), get the mesh set properly, and reinforce the chassis between the motor mount and the rear bushing holder.

As more companies release higher-torque motors, we're going to see more of this. As much as I like their products, Ninco really made it famous, though.

Good list, Brian. It also helps to glue the tires to the wheels so there's no slip.

One of the other things we haven't mentioned is that we're moving towards fly-paper tires. If there's some slip in the tires, even the hoppiest cars settle down a bit. But when we stick tires with more and more grip on the cars while putting in motors with more and more torque, we just make the situation worse.

Do that on your street car, punch the throttle, and see how long your drivetrain lasts...