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Sorry to be late to the party on this one, but I had an almost exact situation last month with my '02S. Same misfire codes on one bank.
I ended up taking mine to my Indy shop where they discovered a bad #4 ignition coil housing on the engine wiring harness. (which looks to me like the only thing you haven't replace)
They state they use to be able to get just the individual housings, but now Porsche wants to sell the entire engine harness. Fortunately for me, they are still able to source the individual units. (And yes, changing one connector housing cleared all the misfire codes)
You may want to check this out before you completely get lost down the rabbit hole.
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I think I have a Porsche problem...
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