Wouldn't it make more sense if when you win a game in berserk mode and you are in a winning streak the points that you gain were doubled (because of the winning streak) after the berserk mode point has already been added. That means that instead of gaining 2*2+1=5 points you would gain (2+1)*2=6 points.
Otherwise there is no real benefit of going berserk. You have to win 4 berserk games to get the points equivalent to one extra win during winning streak but if you lose one game you essentially lose 8 points (4 points of the game you lost and 2 + 2 from your next two wins because you are no longer in a winning streak). But when you are not in a winning streak two berserk wins are equivalent to one extra win. So I think it would make more sense if the ratio of berserk wins to one extra win remained the same during winning streak as well.
Otherwise there is no real benefit of going berserk. You have to win 4 berserk games to get the points equivalent to one extra win during winning streak but if you lose one game you essentially lose 8 points (4 points of the game you lost and 2 + 2 from your next two wins because you are no longer in a winning streak). But when you are not in a winning streak two berserk wins are equivalent to one extra win. So I think it would make more sense if the ratio of berserk wins to one extra win remained the same during winning streak as well.