In my experience with cars running stock, HR lowering springs, M030, PSS9s I would rate HR springs last for handling quality. The problem is you want to add forward rake to the car to improve handling. ROW M030 and PSS9s make this possible. Get the rear too low and the car tends to wobble and loses precision. They are ok if you just want to create a "look" for the street but if precise handling is important, go for the M030 or PSS9s.
FWIW I'm not a KSport fan either.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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