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Well, it sounds like you've exhausted (no pun intended) all options as far as Evo and GIAC are concerned.
There's 2 places here in the Bay Area that deal with Porsches and tuning them. Akkurat and Dynospot. You might want to call them and see if you can get some kind of guess as to why you're seeing what you're seeing. It's worth at least the phone calls.
Again, try to ping the guy on ppbb that has your setup and see what his story is...as I remember everything went smoothly for him and he got significant gains.
But other than getting someone to dyno tune your car on the spot, I don't think there's any other options. Good luck and keep us posted.
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