A better transmitter with exponential (steering curve) adjustment should be top of your shopping list.
Until then, see if you can move the balljoint on the servo horn into a lower hole. This will give less steering movement for a given amount of servo movement. Had to do this when my girlfriend first got a cheap TC setup. Or get a shorter servo horn.
Additionally, if you can lengthen the wheelbase of the car or add some kick-up or caster it will also make it less twitchy and easier to drive.
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