[What's_nitro?]

Is the motor heatsink touching the chassis? If not I think the motor will still be jarred by hard landings and will eventually put you back where you started, except with cut motor wires and a burnt out ESC, too. You may want to shave down the rear motor brace a little or make a U-shape cutout below the motor wires. That would make me feel a lot better if it were my truck. You could try and brace the underside of the motor directly with a contoured piece of 3/8-1/2" thick lexan screwed down from below. It wouldn't need to be strapped down either since the motor would never experience negative G forces unless you were crashing bad anyways.