There are "just" 32 games in my database from your final position, which is surely enough established theory. Highest rated players were Pavasovic and Socko, from the 2009 Austrian Team championship. After 15.d5 Bxd5 16.Rxe7+ Qxe7 17.Bg5 f6 18.Re1 Be6 19.Nd4 0-0-0 20.Nxe6 fg5 21.Nxd8 Qxd8 22.Qxg7 h5 the game was completely equal, and the players soon signed a peace treaty.
Russian Game
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I recently worked out a variation in the Russian Game, but it doesn't seem to be theory. Please share your thoughts with me about this opening.