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I got some really good advice from somebody the other day that seemed to work for our team and that was to let the opposition push our towers early.
By doing that they could no longer push after 15 minutes and we could dominate them. It allowed us to farm early and push later in the game when they no longer had the strength.
Though they did have the tower advantage first, after allowing them to do this.. they also become lazy and didn't concentrate on the game as much as they should have been because of the easy access early game.
It was a great tactical move. Though it doesn't always work, I still recommend it.