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They alignment guy knows how to set thing to factory specifications he does not actually know how to do alignments. He doesn't really know what to do and can't make it workable because the company doesn't really allow for that.
I've not dived into Porsche alignment specs yet but I doubt that lowering springs would prevent proper tow settings which can very much adversely affect regular driving and make it unstable. Castor, think chair castors, could be a bit crazy on lower springs I guess. If left and right sides are set equally then you could maybe get buy but yea wrong castor that could make the car a bit hard to drive. Everyone want's more negative camber so I can't see that causing the car to be unstable. Again equalizing settings left and right would help a lot but a regular alignment shop isn't going to touch it.
My BS asside. Find a tuning shop not a chain shop or dealer to do the alignment, and if putting factory springs on it would correct all this then do that. You'll probably be happy with handling. A collision specialty shop can tell you if the frame is bent.
Save the springs for when you do want to do a race suspension or sell them to the next wan-a-b tuner. I've got a racing Spec Miata and it's not really pleasant to drive on regular roads so I'd say you probably don't want a racing suspension on a street car. If you are going to track it mostly then go for it.
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