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Hello,
if the sway bar didn't have a chance to move / flex - too tight, that might cause that symptom.
But it sounds more that a rear wheel can move a bit back- and forward.
I would also check all suspension components including control arms and wishbones and of all nuts and bolts are fastened to specs.
Eventually you should recheck the alignment parameters from the shop with the Porsche specs. I had in the past, that a shop did an alignment for another car to a similar but different car, which didn't work at all.
Tyre profile could be a problem. But i think you don't have changed tyres, or especially only one tyre. Or mounted it vice versa – one in driving direction, the other not.
Regards, Markus
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