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The creme fraiche gives it a creamier flavour, that's all really. To try and eek out a bit more life, try adding some lime or lemon juice and then a touch of sugar to combat the tartness that'll introduce. The acid might make it last longer.
Generally, I find that you can't really hold these things more than a day before they start to taste funny... best to make and use them same day, tbh.
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