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Just a few thoughts for orengomotors:
The 170kg car will accelerate just as fast as the 70kg car, so I'm glad you are considering additional weights.
Inertial advantage should be kept in the design. The overall weight of the car does not matter so much as the distribution of the weight. Set the center of gravity as far to the rear as can be safe and if the rules allow, make your extra weights (and driver body mass!) movable from raised to lower to ground level over the course of the race. For toy racers, this strategy is very effective but since the altitude change for your courses is so great, the overall effect may be mimimal.
The spinning weight of the wheels, of course, should be kept to a minimum.
With most of the weight at the rear, the rear wheels should have the greater air pressure and front wheels should have just enough air pressure to minimize tire flexing friction and the minimum weight distribution to maintain safe steering. Check weight distributions with the driver seated with helmet, etc.
Are wheel covers necessary if the wheels are enclosed within the body? If not, reduce rotational inertia.
I noticed that the red racer you posted had the driver sitting up at the rear of the car, which put the most mass at the rear.
Very good aerodynamic coaching from aerohead, freebeard and others! Please let us see some photos of the final racer.
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