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Chris-
I don't have any data available to compare against your numbers, but it is surprising that your information suggests that the common notion that:
1) All other things being equal, change in stroke from 66mm to 70.4 mm will change the compression by one point.
2) Mahle/Porsche CR claims are optimistic, and that measured results will reveal lower numbers.
are both false. I'm completely open to the idea that the common conceptions are incorrect. I't wouldn't be the first time!
Is it certain that the pistons in question are RS, or are they the more recently designed "sport" pistons?
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'70 911E short stroke 2.5 MFI. Sold 
'56 Cliff May Prefab
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