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Most likely, you have lowered the car too much. In this case, just make the castor equal on both sides. If you want more castor, raise the car.
The "black tar" is what the factory used to waterproof the holes in the inner fender where the top strut mounts fit. This is seldom cleaned out and replaced after an alignment. Usually, what the factory put there when the car was built is still there. Once the suspension has been adjusted from the factory settings, this crap isn't doing much good.
JR
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