Also make sure your ride height is set right.. about 5.5mm at the rear & 5mm at the front. if the car is too low it will roll as the chassis digs in to the floor & if's too high it will wallow about & topple over as you go into corners - as a rough guide if you haven't got a gauge, slide a wooden placemat or drinks coaster under your car's chassis, if it goes under it's probably OK, but if it won't the car is too low, if when you have slid the mat under the car you can pick up the mat & see daylight under it without the chassis actually lifting it's probably too high.
A trick i was told by some of the guys who run foams (but the trick is also useful but not as common to do with rubber) is to run a coating of superglue around the tyre walls this will stiffen up the tyres & essentially make them lower profile & stop any sideways motion in the wall of the tyre.
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