Adding weight can help, especially if you can't get going, but it isn't free. Don't put it in back of the axle or you have a very unrefined 911.
If you really can't keep it straight at those speeds, without any steering road banking or brake input, then something else is influencing the car. Are the brakes hanging up at all?
What exactly are the tires? If they aren't too old find a tire shop who'll sipe them. It makes a big improvement.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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