I've got a feeling google does this on purpose. Gives your site a bump in rankings when you launch it so your new site isn't buried, then drastically drops you a little later to see how you cope. Might be based on user metrics, who knows...
Same thing happened to 2 of my sites. Great at launch then a bit over a month or two in nothing.
If you add good content, have good metrics and do SMART link building and give it time, google shows some love.
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