I don't know about the specs you quoted but one thing is for sure, my car feels 100% solid at any speed.
Also, the beauty of the early cars is steering feel. It may feel loose, unsettled, nervous to the average driver (not saying its you!!), but at the end of the day this is what makes the car!
Alignment can change a lot as to how the car feels. With some changes you may be able to dial in certain aspects. Consult with a specialist knowing about these things.
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'14 Boxster
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