From what I've heard, Subaru's diesels are not very refined. They only just got into automotive diesels recently. Perhaps you can test drive another one while at the dealer to see if the issue really is universal.
My petrol Renault has the same issue. Perhaps if I wasn't hypermiling it wouldn't be as apparent, but I'm always on the edge of that DFCO envelope. My TDi on the other hand has no such issue.
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