Far from a tire expert, but just attempting to think about this:
1) These are unidirectional tread pattern tires. Could they have put two left-side tires on for example, or two right-side tires?
2) These are all-season tires. Unsure what the factory Yokohama tires were on the 210 Z, but perhaps summer tires? Thus less traction in the back and more tendency to oversteer?
3) The initial overinflation could have been part of the problem. Had a Ford SUV back in the 1990s that would get positively squirrelly if the rear tires were overinflated a few pounds.
4) Something happened during the tire switch? Accident during the lift operation, etc?
5) Might check alignment.
Sorry, can't be more definitive. Perhaps some of the more knowledgeable guys here can help more.
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