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I know it sounds stupid but I came across that many times. Last time was last month when my friend told me he thinks his rear suspension is fried.
Every time he hit a road bump, he heard a "clanck" noise fro the back of the car.
Turn out to be a loos part of the convertible top.
Another friend tried to locate a noise for 6 months (non Porsche car)! Just to find out it was a soda can under the seat.
Now, I'm not sang that's the case with you. And I apologies if I offend your in any way, but check if you have anything "rolling" in your front trunk. Maybe the jack or the tool kit.
It sounds like you know your way around your car, and if you didn't see anything wrong in your suspension (and so is your mechanic), could be nothing is wrong with it.
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