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I think you can use a little less lash than recommended. It's probably better than a little more. If you stray too much from the recommended though it can give you a whine. Because your diff Centre is sort of Floating around in there and not meshing good and you'll hear a noise when your diff is off load. And with too much lash it also gets real clunky.
I'd stay with the specs or a little Less. Hope that post made sense I've had a few cans haha.