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I switch to synthetic 5W30 when the weather gets cold. That helps cold starts. I've been living with this problem for a long time too. The only time it really bugs me is that sometimes rather than recovering from the rough idle, it will stall, and then backfire when I try to restart it. I've got a pop-off valve, but still I don't like backfires. There must be something unique to the 78 or 79 SC's that is causing this problem. Maybe the WUR just isn't a very good match for the engine. I've seen the articles on this website about modifying your WUR to make it adjustable. Maybe that's what it will take.
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Bill Krause
'79 911SC Euro
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