Welcome to the forum Dystopius, and welcome to boxster ownership. Sounds like you might be new to online forums as well.
I'll let others dissect your inquiries and respond, I will give some advise, I suggest you get try to use the search function for the forum, there is a wealth of knowledge here on many common attributes associated with our boxsters. For example the speed discrepancy you experienced is very common among the Porsche cars.
Happy motoring.
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kabel
Orlando - 99 BMW M Coupe (autocross toy), '11 Mazdaspeed 3 (dog hauler), '99 10AE Miata (the new daily driver)
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